template - Page 66 - Developer IT

Get type of the parameter from list of objects, templates, C++

- by CrocodileDundee

This question follows to my previous question Get type of the parameter, templates, C++ There is the following data structure: Object1.h template <class T> class Object1 { private: T a1; T a2; public: T getA1() {return a1;} typedef T type; }; Object2.h template <class T> class Object2: public Object1 <T> { private: T b1; T b2; public: T getB1() {return b1;} } List.h template <typename Item> struct TList { typedef std::vector <Item> Type; }; template <typename Item> class List { private: typename TList <Item>::Type items; }; Is there any way how to get type T of an object from the list of objects (i.e. Object is not a direct parameter of the function but a template parameter)? template <class Object> void process (List <Object> *objects) { typename Object::type a1 = objects[0].getA1(); // g++ error: 'Object1<double>*' is not a class, struct, or union type } But his construction works (i.e. Object represents a parameter of the function) template <class Object> void process (Object *o1) { typename Object::type a1 = o1.getA1(); // OK }

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static member specialization of templated child class and templated base class

- by b3nj1

I'm trying to have a templated class (here C) that inherits from another templated class (here A) and perform static member specialization (of int var here), but I cant get the right syntax to do so (if it's possible #include <iostream> template<typename derived> class A { public: static int var; }; //This one works fine class B :public A<B> { public: B() { std::cout << var << std::endl; } }; template<> int A<B>::var = 9; //This one doesn't works template<typename type> class C :public A<C<type> > { public: C() { std::cout << var << std::endl; } }; //template<> template<typename type> int A<C<type> >::a = 10; int main() { B b; C<int> c; return 0; } I put an example that works with a non templated class (here B) and i can get the static member specialization of var, but for C that just doesn't work. Here is what gcc tells me : test.cpp: In constructor ‘C<type>::C()’: test.cpp:29:26: error: ‘var’ was not declared in this scope test.cpp: At global scope: test.cpp:34:18: error: template definition of non-template ‘int A<C<type> >::a’ I'm using gcc version 4.6.3, thanks for any help

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XSL(like) declarative language as MVC view over strongtyped model?

- by Martin Kool

As a huge XSL fan, I am very happy to use xsl as the view in our proprietary MVC framework on ASP.NET. Objects in the model are serialized under the hood using .NET's xml serializer, and we use quite atomic xsl templates to declare how each object or property should transform. For example: <xsl:template match="/Article"> <html> <body> <div class="article"> <xsl:apply-templates /> </div> </body> </html> </xsl:template> <xsl:template match="Article/Title"> <h1> <xsl:apply-templates /> </h1> </xsl:template> <xsl:template match="@*|text()"> <xsl:copy /> </xsl:template> This mechanism allows us to quickly override default matching templates, like having a template matching on the last item in a list, or the selected one, etc. Also, xsl extension objects in .NET allow us just the bit of extra grip that we need. Common shared templates can be split up and included. However Even though I can ignore the verbosity downside of xsl (because Visual Studio schema intellisense + snippets really is slick, praise to the VS-team), the downside of not having intellisense over strongtyped objects in the model is really something that's bugging me. I've seen ASP.NET MVC + user controls in action and really starting to love it, but I wonder; Is there a way of getting some sort of intellisense over XML that we're iterating over, or do you know of a language that offers the freedom and declarativeness of XSL but has the strongtype/intellisense benefits of say webforms/usercontrols/asp.net.mvc-view? (I probably know the answer: "no", and I'll find myself using Phil Haack's utterly cool mvc shizzle soon...)

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Magento - Add CMS Block to One Page

- by a1anm

I have this code in a xml layout file: <reference name="left"> <block type="blog/blog" name="left.blog.menu" before="-"> <action method="setTemplate" ifconfig="blog/menu/left"> <template>aw_blog/menu.phtml</template> </action> <block type="blog/tags" name="blog_tags" /> </block> </reference> I want to add a cms static block to the blog pages using this code: <block type="cms/block" name="brand_list"> <action method="setBlockId"><block_id>brand_list</block_id></action> </block> If I add it in directly after this line: <reference name="left"> It works but it is then displayed on every page. How can I get it to show only on the blog pages? Thanks. Edit: Here is the entire xml file: <layout version="0.1.0"> <default> <reference name="footer_links"> <block type="blog/blog" name="add.blog.footer"> <block type="blog/tags" name="blog_tags" /> <action method="addFooterLink" ifconfig="blog/menu/footer"></action> </block> </reference> <reference name="right"> <block type="blog/blog" name="right.blog.menu" before="-"> <action method="setTemplate" ifconfig="blog/menu/right" ifvalue="1"> <template>aw_blog/menu.phtml</template> </action> <block type="blog/tags" name="blog_tags" /> </block> </reference> <reference name="left"> <block type="blog/blog" name="left.blog.menu" before="-"> <action method="setTemplate" ifconfig="blog/menu/left"> <template>aw_blog/menu.phtml</template> </action> <block type="blog/tags" name="blog_tags" /> </block> </reference> <reference name="top.links"> <block type="blog/blog" name="add.blog.link"> <action method="addTopLink" ifconfig="blog/menu/top"></action> <block type="blog/tags" name="blog_tags" /> </block> </reference> <reference name="head"> <action method="addItem"><type>skin_css</type><name>aw_blog/css/style.css</name></action> </reference> </default> <blog_index_index> <reference name="content"> <block type="blog/blog" name="blog" template="aw_blog/blog.phtml"/> </reference> </blog_index_index> <blog_index_list> <reference name="content"> <block type="blog/blog" name="blog" template="aw_blog/blog.phtml"/> </reference> </blog_index_list> <blog_post_view> <reference name="content"> <block type="blog/post" name="post" template="aw_blog/post.phtml"> <block type="socialbookmarking/bookmarks" name="bookmarks" template="bookmarks/bookmarks.phtml"/> </block> </reference> </blog_post_view> <blog_cat_view> <reference name="content"> <block type="blog/cat" name="cat" template="aw_blog/cat.phtml" /> </reference> </blog_cat_view> <blog_rss_index> <block type="blog/rss" output="toHtml" name="rss.blog.new"/> </blog_rss_index> </layout>

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std::basic_stringstream<unsigned char> won't compile with MSVC 10

- by Michael J

I'm trying to get UTF-8 chars to co-exist with ANSI 8-bit chars. My strategy has been to represent utf-8 chars as unsigned char so that appropriate overloads of functions can be used for the two character types. e.g. namespace MyStuff { typedef uchar utf8_t; typedef std::basic_string<utf8_t> U8string; } void SomeFunc(std::string &s); void SomeFunc(std::wstring &s); void SomeFunc(MyStuff::U8string &s); This all works pretty well until I try to use a stringstream. std::basic_ostringstream<MyStuff::utf8_t> ostr; ostr << 1; MSVC Visual C++ Express V10 won't compile this: c:\program files\microsoft visual studio 10.0\vc\include\xlocmon(213): warning C4273: 'id' : inconsistent dll linkage c:\program files\microsoft visual studio 10.0\vc\include\xlocnum(65) : see previous definition of 'public: static std::locale::id std::numpunct<unsigned char>::id' c:\program files\microsoft visual studio 10.0\vc\include\xlocnum(65) : while compiling class template static data member 'std::locale::id std::numpunct<_Elem>::id' with [ _Elem=Tk::utf8_t ] c:\program files\microsoft visual studio 10.0\vc\include\xlocnum(1149) : see reference to function template instantiation 'const _Facet &std::use_facet<std::numpunct<_Elem>>(const std::locale &)' being compiled with [ _Facet=std::numpunct<Tk::utf8_t>, _Elem=Tk::utf8_t ] c:\program files\microsoft visual studio 10.0\vc\include\xlocnum(1143) : while compiling class template member function 'std::ostreambuf_iterator<_Elem,_Traits> std::num_put<_Elem,_OutIt>:: do_put(_OutIt,std::ios_base &,_Elem,std::_Bool) const' with [ _Elem=Tk::utf8_t, _Traits=std::char_traits<Tk::utf8_t>, _OutIt=std::ostreambuf_iterator<Tk::utf8_t,std::char_traits<Tk::utf8_t>> ] c:\program files\microsoft visual studio 10.0\vc\include\ostream(295) : see reference to class template instantiation 'std::num_put<_Elem,_OutIt>' being compiled with [ _Elem=Tk::utf8_t, _OutIt=std::ostreambuf_iterator<Tk::utf8_t,std::char_traits<Tk::utf8_t>> ] c:\program files\microsoft visual studio 10.0\vc\include\ostream(281) : while compiling class template member function 'std::basic_ostream<_Elem,_Traits> & std::basic_ostream<_Elem,_Traits>::operator <<(int)' with [ _Elem=Tk::utf8_t, _Traits=std::char_traits<Tk::utf8_t> ] c:\program files\microsoft visual studio 10.0\vc\include\sstream(526) : see reference to class template instantiation 'std::basic_ostream<_Elem,_Traits>' being compiled with [ _Elem=Tk::utf8_t, _Traits=std::char_traits<Tk::utf8_t> ] c:\users\michael\dvl\tmp\console\console.cpp(23) : see reference to class template instantiation 'std::basic_ostringstream<_Elem,_Traits,_Alloc>' being compiled with [ _Elem=Tk::utf8_t, _Traits=std::char_traits<Tk::utf8_t>, _Alloc=std::allocator<uchar> ] . c:\program files\microsoft visual studio 10.0\vc\include\xlocmon(213): error C2491: 'std::numpunct<_Elem>::id' : definition of dllimport static data member not allowed with [ _Elem=Tk::utf8_t ] Any ideas? ** Edited 19 June 2012 ** OK, I've gotten closer to understanding this, but not how to solve it. As we all know, static class variables get defined twice: once in the class definition and once outside the class definition which establishes storage space. e.g. // in .h file class CFoo { // ... static int x; }; // in .cpp file int CFoo::x = 42; Now in the VC10 headers we get something like this: template<class _Elem> class numpunct : public locale::facet { // ... _CRTIMP2_PURE static locale::id id; // ... } When the header is included in an application, _CRTIMP2_PURE is defined as __declspec(dllimport), which means that the variable is imported from a dll. Now the header also contains the following template<class _Elem> locale::id numpunct<_Elem>::id; Note the absence of the __declspec(dllimport) qualifier. i.e. The class declaration says that the static linkage of the id variable is in the dll, but for the general case, it gets declared outside the dll. For the known cases, there are specialisations. template locale::id numpunct<char>::id; template locale::id numpunct<wchar_t>::id; These are protected by #ifs so that they are only included when building the DLL. They are excluded otherwise. i.e. the char and wchar_t versions of numpunct ARE inside the dll So we have the class definition saying that id's storage is in the DLL, but that is only true for the char and wchar_t specialisations, meaning that my unsigned char version is doomed. :-( The only way forward that I can think of is to create my own specialisation: basically copying it from the header file and fixing it. This raises many issues. Anybody have a better idea?

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error - inherited class field undeclared according to g++

- by infoholic_anonymous

I have a code that has the following logic. g++ gives me the error that I have not declared n in my iterator2. What could be wrong? template <typename T> class List{ template <typename TT> class Node; Node<T> *head; /* (...) */ template <bool D> class iterator1{ protected: Node<T> n; public: iterator1( Node<T> *nn ) { n = nn } /* (...) */ }; template <bool D> class iterator2 : public iterator1<D>{ public: iterator2( Node<T> *nn ) : iterator1<D>( nn ) {} void fun( Node<T> *nn ) { n = nn; } /* (...) */ }; }; EDIT : I attach the actual header file. iterator1 would be iterable_frame and iterator2 - switchable_frame. #ifndef LST_H #define LST_H template <typename T> class List { public: template <typename TT> class Node; private: Node<T> *head; public: List() { head = new Node<T>; } ~List() { empty_list(); delete head; } List( const List &l ); inline bool is_empty() const { return head->next[0] == head; } void empty_list(); template <bool DIM> class iterable_frame { protected: Node<T> *head; Node<T> **caret; public: iterable_frame( const List &l ) { head = *(caret = &l.head); } iterable_frame( const iterable_frame &i ) { head = *(caret = i.caret); } ~iterable_frame() {} /* (...) - a few methods follow */ template <bool _DIM> friend class supervised_frame; }; template <bool DIM> class switchable_frame : public iterable_frame<DIM> { Node<T> *main_head; public: switchable_frame( const List& l ) : iterable_frame<DIM>(l) { main_head = head; } inline bool next_frame() { caret = &head->next[!DIM]; head = *caret; return head != main_head; } }; template <bool DIM> class supervised_frame { iterable_frame<DIM> sentinels; iterable_frame<DIM> cells; public: supervised_frame( const List &l ) : sentinels(l), cells(l) {} ~supervised_frame() {} /* (...) - a few methods follow */ }; template <typename TT> class Node { unsigned index[2]; TT num; Node<TT> *next[2]; public: Node( unsigned x = 0, unsigned y = 0 ) { index[0]=x; index[1]=y; next[0] = this; next[1] = this; } Node( unsigned x, unsigned y, TT d ) { index[0]=x; index[1]=y; num=d; next[0] = this; next[1] = this; } Node( const Node &n ) { index[0] = n.index[0]; index[1] = n.index[1]; num = n.num; next[0] = next[1] = this; } ~Node() {} friend class List; }; }; #include "List.cpp" #endif the exact error log is the following: In file included from main.cpp:1: List.h: In member function ‘bool List<T>::switchable_frame<DIM>::next_frame()’: List.h:77: error: ‘caret’ was not declared in this scope

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Any software for pattern-matching and -rewriting source code?

- by Steven A. Lowe

I have some old software (in a language that's not dead but is dead to me ;-)) that implements a basic pattern-matching and -rewriting system for source code. I am considering resurrecting this code, translating it into a modern language, and open-sourcing the project as a refactoring power-tool. Before I go much further, I want to know if anything like this exists already (my google-fu is fanning air on this tonight). Here's how it works: the pattern-matching part matches source-code patterns spanning multiple lines of code using a template with binding variables, the pattern-rewriting part uses a template to rewrite the matched code, inserting the contents of the bound variables from the matching template matching and rewriting templates are associated (1:1) by a simple (unconditional) rewrite rule the software operates on the abstract syntax tree (AST) of the input application, and outputs a modified AST which can then be regenerated into new source code for example, suppose we find a bunch of while-loops that really should be for-loops. The following template will match the while-loop pattern: Template oldLoopPtrn int @cnt@ = 0; while (@cnt@ < @max@) { … @body@ ++@cnt@; } End_Template while the following template will specify the output rewrite pattern: Template newLoopPtrn for(int @cnt@ = 0; @cnt@ < @max@; @cnt@++) { @body@ } End_Template and a simple rule to associate them Rule oldLoopPtrn --> newLoopPtrn so code that looks like this int i=0; while(i<arrlen) { printf("element %d: %f\n",i,arr[i]); ++i; } gets automatically rewritten to look like this for(int i = 0; i < arrlen; i++) { printf("element %d: %f\n",i,arr[i]); } The closest thing I've seen like this is some of the code-refactoring tools, but they seem to be geared towards interactive rewriting of selected snippets, not wholesale automated changes. I believe that this kind of tool could supercharge refactoring, and would work on multiple languages (even HTML/CSS). I also believe that converting and polishing the code base would be a huge project that I simply cannot do alone in any reasonable amount of time. So, anything like this out there already? If not, any obvious features (besides rewrite-rule conditions) to consider? EDIT: The one feature of this system that I like very much is that the template patterns are fairly obvious and easy to read because they're written in the same language as the target source code, not in some esoteric mutated regex/BNF format.

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Uses of a C++ Arithmetic Promotion Header

- by OlduvaiHand

I've been playing around with a set of templates for determining the correct promotion type given two primitive types in C++. The idea is that if you define a custom numeric template, you could use these to determine the return type of, say, the operator+ function based on the class passed to the templates. For example: // Custom numeric class template <class T> struct Complex { Complex(T real, T imag) : r(real), i(imag) {} T r, i; // Other implementation stuff }; // Generic arithmetic promotion template template <class T, class U> struct ArithmeticPromotion { typedef typename X type; // I realize this is incorrect, but the point is it would // figure out what X would be via trait testing, etc }; // Specialization of arithmetic promotion template template <> class ArithmeticPromotion<long long, unsigned long> { typedef typename unsigned long long type; } // Arithmetic promotion template actually being used template <class T, class U> Complex<typename ArithmeticPromotion<T, U>::type> operator+ (Complex<T>& lhs, Complex<U>& rhs) { return Complex<typename ArithmeticPromotion<T, U>::type>(lhs.r + rhs.r, lhs.i + rhs.i); } If you use these promotion templates, you can more or less treat your user defined types as if they're primitives with the same promotion rules being applied to them. So, I guess the question I have is would this be something that could be useful? And if so, what sorts of common tasks would you want templated out for ease of use? I'm working on the assumption that just having the promotion templates alone would be insufficient for practical adoption. Incidentally, Boost has something similar in its math/tools/promotion header, but it's really more for getting values ready to be passed to the standard C math functions (that expect either 2 ints or 2 doubles) and bypasses all of the integral types. Is something that simple preferable to having complete control over how your objects are being converted? TL;DR: What sorts of helper templates would you expect to find in an arithmetic promotion header beyond the machinery that does the promotion itself?

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XSLT generating attributes if source-Element is in parameterfile

- by Siegfried

Hi, i got an xml-file with some elements. For some of these is an aqvivalent in a parameter xml-file along with some other elements. I want to add these other elements from parm-file as parameter to output file if element-names are matching. (the Attributes should only be generated if an element "InvoiceHeader" exists in the source-xml. Here is my code... <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:fn="http://www.w3.org/2005/xpath-functions"> <xsl:variable name="rpl" select="document('ParamInvoice.xml')"></xsl:variable> <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/> <xsl:template match="/"> <xsl:apply-templates></xsl:apply-templates> </xsl:template> <xsl:template match="*"> <xsl:copy> <xsl:if test="$rpl/StoraInvoice/local-name()"> <xsl:call-template name="AttributeErzeugen"> <xsl:with-param name="attr" select="$rpl/StoraInvoice/local-name()"></xsl:with-param> </xsl:call-template> </xsl:if> <xsl:apply-templates></xsl:apply-templates> </xsl:copy> </xsl:template> <xsl:template name="AttributeErzeugen"> <xsl:param name="attr"></xsl:param> <xsl:for-each select="$attr"> <xsl:attribute name="{Attibute/@name}"><xsl:value-of select="."></xsl:value- of></xsl:attribute> </xsl:for-each> </xsl:template> </xsl:stylesheet> and here the param-file <?xml version="1.0" encoding="UTF-8"?> <StoraInvoice> <InvoiceHeader> <Attribute name="Fuehrend">YYY</Attribute> <Attribute name="Feld">FFFF</Attribute> <Attribute name="Format">XYZXYZ</Attribute> </InvoiceHeader> </StoraInvoice> Siegfried

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How to apply or chain multiple matching templates in XSLT?

- by Ignatius

I am working on a stylesheet employing many templates with match attributes: <xsl:template match="//one" priority="0.7"> <xsl:param name="input" select="."/> <xsl:value-of select="util:uppercase($input)"/> <xsl:next-match /> </xsl:template> <xsl:template match="/stuff/one"> <xsl:param name="input" select="."/> <xsl:value-of select="util:add-period($input)"/> </xsl:template> <xsl:function name="util:uppercase"> <xsl:param name="input"/> <xsl:value-of select="upper-case($input)"/> </xsl:function> <xsl:function name="util:add-period"> <xsl:param name="input"/> <xsl:value-of select="concat($input,'.')"/> </xsl:function> What I would like to do is be able to 'chain' the two functions above, so that an input of 'string' would be rendered in the output as 'STRING.' (with the period.) I would like to do this in such a way that doesn't require knowledge of other templates in any other template. So, for instance, I would like to be able to add a "util:add-colon" method without having to open up the hood and monkey with the existing templates. I was playing around with the <xsl:next-match/> instruction to accomplish this. Adding it to the first template above does of course invoke both util:uppercase and util:add-period, but the output is an aggregation of each template output (i.e. 'STRINGstring.') It seems like there should be an elegant way to chain any number of templates together using something like <xsl:next-match/>, but have the output of each template feed the input of the next one in the chain. Am I overlooking something obvious?

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C++0x: How can I access variadic tuple members by index at runtime?

- by nonoitall

I have written the following basic Tuple template: template <typename... T> class Tuple; template <uintptr_t N, typename... T> struct TupleIndexer; template <typename Head, typename... Tail> class Tuple<Head, Tail...> : public Tuple<Tail...> { private: Head element; public: template <uintptr_t N> typename TupleIndexer<N, Head, Tail...>::Type& Get() { return TupleIndexer<N, Head, Tail...>::Get(*this); } uintptr_t GetCount() const { return sizeof...(Tail) + 1; } private: friend struct TupleIndexer<0, Head, Tail...>; }; template <> class Tuple<> { public: uintptr_t GetCount() const { return 0; } }; template <typename Head, typename... Tail> struct TupleIndexer<0, Head, Tail...> { typedef Head& Type; static Type Get(Tuple<Head, Tail...>& tuple) { return tuple.element; } }; template <uintptr_t N, typename Head, typename... Tail> struct TupleIndexer<N, Head, Tail...> { typedef typename TupleIndexer<N - 1, Tail...>::Type Type; static Type Get(Tuple<Head, Tail...>& tuple) { return TupleIndexer<N - 1, Tail...>::Get(*(Tuple<Tail...>*) &tuple); } }; It works just fine, and I can access elements in array-like fashion by using tuple.Get<Index() - but I can only do that if I know the index at compile-time. However, I need to access elements in the tuple by index at runtime, and I won't know at compile-time which index needs to be accessed. Example: int chosenIndex = getUserInput(); cout << "The option you chose was: " << tuple.Get(chosenIndex) << endl; What's the best way to do this?

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Sanitizing DB inputs with XSLT

- by azathoth

Hello I've been looking for a method to strip my XML content of apostrophes (') like: <name> Jim O'Connor</name> since my DBMS is complaining of receiving those. By looking at the example described here, that is supposed to replace ' with '', I constructed the following script: <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes" /> <xsl:template match="node()|@*"> <xsl:copy> <xsl:apply-templates select="node()|@*" /> </xsl:copy> </xsl:template> <xsl:template name="sqlApostrophe"> <xsl:param name="string" /> <xsl:variable name="apostrophe">'</xsl:variable> <xsl:choose> <xsl:when test="contains($string,$apostrophe)"> <xsl:value-of select="concat(substring-before($string,$apostrophe), $apostrophe,$apostrophe)" disable-output-escaping="yes" /> <xsl:call-template name="sqlApostrophe"> <xsl:with-param name="string" select="substring-after($string,$apostrophe)" /> </xsl:call-template> </xsl:when> <xsl:otherwise> <xsl:value-of select="$string" disable-output-escaping="yes" /> </xsl:otherwise> </xsl:choose> </xsl:template> <xsl:template match="node()|@*"> <xsl:apply-templates name="sqlApostrophe"/> </xsl:template> </xsl:stylesheet> However, the processor isn't accepting it. What am I missing here? Is there a better way to get rid of the apostrophes? Perhaps another approach for sanitizing DB inputs by using XSLT? Thanks for your help

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Why is my PowerShell multi dimensional array being interpreted as a 1 dimensional array?

- by Jim

I have the following code: function HideTemplates($File, $Templates) { foreach ($Template in $Templates) { Write-Host $Template[0] $Template[1] $Template[2] } } HideTemplates "test.xml" @(("one", "two", "three")) HideTemplates "test.xml" @(("four", "five", "six"), ("seven", "eight", "nine")) It prints: o n e t w o t h r four five six seven eight nine I want it to print: one two three four five six seven eight nine Am I doing something wrong in my code? Is there a way to force PowerShell to tread a multi-dimensional array with a single item differently?

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When I change templates in Netbeans, why doesn't anything happen?

- by Matthew

I want to modify the "Java class" template, so that the class javadoc comment includes more than just the author. In Netbeans 6.8., I go to Tools Templates Java Java Class, and modify the template. However, nothing seems to change. I tried restarting Netbeans, just in case, but the old template is still used. How do I get Netbeans to recognize changes to the template for Java Classes?

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PHP get all function arguments as $key => $value array?

- by web lover

<?php function register_template(){ print_r(func_get_args()); # the result was an array ( [0] => my template [1] => screenshot.png [2] => nice template .. ) } register_template( # unkown number of arguments $name = "my template", $screenshot = "screenshot.png", $description = "nice template .. " ) ?> BUT , I want the result array as $key = $value form , $key represents the parameter name.

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Determining if types alias to the same underlying type in C++

- by emchristiansen

I'd like to write a templated function which changes its behavior depending on template class types passed in. To do this, I'd like to determine the type passed in. For example, something like this: template <class T> void foo() { if (T == int) { // Sadly, this sort of comparison doesn't work printf("Template parameter was int\n"); } else if (T == char) { printf("Template parameter was char\n"); } } Is this possible?

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Detect if class has overloaded function fails on Comeau compiler

- by Frank

Hi Everyone, I'm trying to use SFINAE to detect if a class has an overloaded member function that takes a certain type. The code I have seems to work correctly in Visual Studio and GCC, but does not compile using the Comeau online compiler. Here is the code I'm using: #include <stdio.h> //Comeau doesnt' have boost, so define our own enable_if_c template<bool value> struct enable_if_c { typedef void type; }; template<> struct enable_if_c< false > {}; //Class that has the overloaded member function class TestClass { public: void Func(float value) { printf( "%f\n", value ); } void Func(int value) { printf( "%i\n", value ); } }; //Struct to detect if TestClass has an overloaded member function for type T template<typename T> struct HasFunc { template<typename U, void (TestClass::*)( U )> struct SFINAE {}; template<typename U> static char Test(SFINAE<U, &TestClass::Func>*); template<typename U> static int Test(...); static const bool Has = sizeof(Test<T>(0)) == sizeof(char); }; //Use enable_if_c to only allow the function call if TestClass has a valid overload for T template<typename T> typename enable_if_c<HasFunc<T>::Has>::type CallFunc(TestClass &test, T value) { test.Func( value ); } int main() { float value1 = 0.0f; int value2 = 0; TestClass testClass; CallFunc( testClass, value1 ); //Should call TestClass::Func( float ) CallFunc( testClass, value2 ); //Should call TestClass::Func( int ) } The error message is: no instance of function template "CallFunc" matches the argument list. It seems that HasFunc::Has is false for int and float when it should be true. Is this a bug in the Comeau compiler? Am I doing something that's not standard? And if so, what do I need to do to fix it?

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Rails: i have a class method and i want to modify something of the instance

- by Totty

Rails: i have a class method and i want to modify something of the instance something like this: class Test < Main template :box def test # here I want to access the template name, that is box end end class Main def initialize end def self.template(name) # here I have to save somehow the template name # remember is not an instance. end end that is similar to the model classes: # in the model has_many :projects How do I do it?

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Rendering ASP.NET MVC Views to String

- by Rick Strahl

It's not uncommon in my applications that I require longish text output that does not have to be rendered into the HTTP output stream. The most common scenario I have for 'template driven' non-Web text is for emails of all sorts. Logon confirmations and verifications, email confirmations for things like orders, status updates or scheduler notifications - all of which require merged text output both within and sometimes outside of Web applications. On other occasions I also need to capture the output from certain views for logging purposes. Rather than creating text output in code, it's much nicer to use the rendering mechanism that ASP.NET MVC already provides by way of it's ViewEngines - using Razor or WebForms views - to render output to a string. This is nice because it uses the same familiar rendering mechanism that I already use for my HTTP output and it also solves the problem of where to store the templates for rendering this content in nothing more than perhaps a separate view folder. The good news is that ASP.NET MVC's rendering engine is much more modular than the full ASP.NET runtime engine which was a real pain in the butt to coerce into rendering output to string. With MVC the rendering engine has been separated out from core ASP.NET runtime, so it's actually a lot easier to get View output into a string. Getting View Output from within an MVC Application If you need to generate string output from an MVC and pass some model data to it, the process to capture this output is fairly straight forward and involves only a handful of lines of code. The catch is that this particular approach requires that you have an active ControllerContext that can be passed to the view. This means that the following approach is limited to access from within Controller methods. Here's a class that wraps the process and provides both instance and static methods to handle the rendering:/// <summary> /// Class that renders MVC views to a string using the /// standard MVC View Engine to render the view. /// /// Note: This class can only be used within MVC /// applications that have an active ControllerContext. /// </summary> public class ViewRenderer { /// <summary> /// Required Controller Context /// </summary> protected ControllerContext Context { get; set; } public ViewRenderer(ControllerContext controllerContext) { Context = controllerContext; } /// <summary> /// Renders a full MVC view to a string. Will render with the full MVC /// View engine including running _ViewStart and merging into _Layout /// </summary> /// <param name="viewPath"> /// The path to the view to render. Either in same controller, shared by /// name or as fully qualified ~/ path including extension /// </param> /// <param name="model">The model to render the view with</param> /// <returns>String of the rendered view or null on error</returns> public string RenderView(string viewPath, object model) { return RenderViewToStringInternal(viewPath, model, false); } /// <summary> /// Renders a partial MVC view to string. Use this method to render /// a partial view that doesn't merge with _Layout and doesn't fire /// _ViewStart. /// </summary> /// <param name="viewPath"> /// The path to the view to render. Either in same controller, shared by /// name or as fully qualified ~/ path including extension /// </param> /// <param name="model">The model to pass to the viewRenderer</param> /// <returns>String of the rendered view or null on error</returns> public string RenderPartialView(string viewPath, object model) { return RenderViewToStringInternal(viewPath, model, true); } public static string RenderView(string viewPath, object model, ControllerContext controllerContext) { ViewRenderer renderer = new ViewRenderer(controllerContext); return renderer.RenderView(viewPath, model); } public static string RenderPartialView(string viewPath, object model, ControllerContext controllerContext) { ViewRenderer renderer = new ViewRenderer(controllerContext); return renderer.RenderPartialView(viewPath, model); } protected string RenderViewToStringInternal(string viewPath, object model, bool partial = false) { // first find the ViewEngine for this view ViewEngineResult viewEngineResult = null; if (partial) viewEngineResult = ViewEngines.Engines.FindPartialView(Context, viewPath); else viewEngineResult = ViewEngines.Engines.FindView(Context, viewPath, null); if (viewEngineResult == null) throw new FileNotFoundException(Properties.Resources.ViewCouldNotBeFound); // get the view and attach the model to view data var view = viewEngineResult.View; Context.Controller.ViewData.Model = model; string result = null; using (var sw = new StringWriter()) { var ctx = new ViewContext(Context, view, Context.Controller.ViewData, Context.Controller.TempData, sw); view.Render(ctx, sw); result = sw.ToString(); } return result; } } The key is the RenderViewToStringInternal method. The method first tries to find the view to render based on its path which can either be in the current controller's view path or the shared view path using its simple name (PasswordRecovery) or alternately by its full virtual path (~/Views/Templates/PasswordRecovery.cshtml). This code should work both for Razor and WebForms views although I've only tried it with Razor Views. Note that WebForms Views might actually be better for plain text as Razor adds all sorts of white space into its output when there are code blocks in the template. The Web Forms engine provides more accurate rendering for raw text scenarios. Once a view engine is found the view to render can be retrieved. Views in MVC render based on data that comes off the controller like the ViewData which contains the model along with the actual ViewData and ViewBag. From the View and some of the Context data a ViewContext is created which is then used to render the view with. The View picks up the Model and other data from the ViewContext internally and processes the View the same it would be processed if it were to send its output into the HTTP output stream. The difference is that we can override the ViewContext's output stream which we provide and capture into a StringWriter(). After rendering completes the result holds the output string. If an error occurs the error behavior is similar what you see with regular MVC errors - you get a full yellow screen of death including the view error information with the line of error highlighted. It's your responsibility to handle the error - or let it bubble up to your regular Controller Error filter if you have one. To use the simple class you only need a single line of code if you call the static methods. Here's an example of some Controller code that is used to send a user notification to a customer via email in one of my applications:[HttpPost] public ActionResult ContactSeller(ContactSellerViewModel model) { InitializeViewModel(model); var entryBus = new busEntry(); var entry = entryBus.LoadByDisplayId(model.EntryId); if ( string.IsNullOrEmpty(model.Email) ) entryBus.ValidationErrors.Add("Email address can't be empty.","Email"); if ( string.IsNullOrEmpty(model.Message)) entryBus.ValidationErrors.Add("Message can't be empty.","Message"); model.EntryId = entry.DisplayId; model.EntryTitle = entry.Title; if (entryBus.ValidationErrors.Count > 0) { ErrorDisplay.AddMessages(entryBus.ValidationErrors); ErrorDisplay.ShowError("Please correct the following:"); } else { string message = ViewRenderer.RenderView("~/views/template/ContactSellerEmail.cshtml",model, ControllerContext); string title = entry.Title + " (" + entry.DisplayId + ") - " + App.Configuration.ApplicationName; AppUtils.SendEmail(title, message, model.Email, entry.User.Email, false, false)) } return View(model); } Simple! The view in this case is just a plain MVC view and in this case it's a very simple plain text email message (edited for brevity here) that is created and sent off:@model ContactSellerViewModel @{ Layout = null; }re: @Model.EntryTitle @Model.ListingUrl @Model.Message ** SECURITY ADVISORY - AVOID SCAMS ** Avoid: wiring money, cross-border deals, work-at-home ** Beware: cashier checks, money orders, escrow, shipping ** More Info: @(App.Configuration.ApplicationBaseUrl)scams.html Obviously this is a very simple view (I edited out more from this page to keep it brief) - but other template views are much more complex HTML documents or long messages that are occasionally updated and they are a perfect fit for Razor rendering. It even works with nested partial views and _layout pages. Partial Rendering Notice that I'm rendering a full View here. In the view I explicitly set the Layout=null to avoid pulling in _layout.cshtml for this view. This can also be controlled externally by calling the RenderPartial method instead: string message = ViewRenderer.RenderPartialView("~/views/template/ContactSellerEmail.cshtml",model, ControllerContext); with this line of code no layout page (or _viewstart) will be loaded, so the output generated is just what's in the view. I find myself using Partials most of the time when rendering templates, since the target of templates usually tend to be emails or other HTML fragment like output, so the RenderPartialView() method is definitely useful to me. Rendering without a ControllerContext The preceding class is great when you're need template rendering from within MVC controller actions or anywhere where you have access to the request Controller. But if you don't have a controller context handy - maybe inside a utility function that is static, a non-Web application, or an operation that runs asynchronously in ASP.NET - which makes using the above code impossible. I haven't found a way to manually create a Controller context to provide the ViewContext() what it needs from outside of the MVC infrastructure. However, there are ways to accomplish this, but they are a bit more complex. It's possible to host the RazorEngine on your own, which side steps all of the MVC framework and HTTP and just deals with the raw rendering engine. I wrote about this process in Hosting the Razor Engine in Non-Web Applications a long while back. It's quite a process to create a custom Razor engine and runtime, but it allows for all sorts of flexibility. There's also a RazorEngine CodePlex project that does something similar. I've been meaning to check out the latter but haven't gotten around to it since I have my own code to do this. The trick to hosting the RazorEngine to have it behave properly inside of an ASP.NET application and properly cache content so templates aren't constantly rebuild and reparsed. Anyway, in the same app as above I have one scenario where no ControllerContext is available: I have a background scheduler running inside of the app that fires on timed intervals. This process could be external but because it's lightweight we decided to fire it right inside of the ASP.NET app on a separate thread. In my app the code that renders these templates does something like this:var model = new SearchNotificationViewModel() { Entries = entries, Notification = notification, User = user }; // TODO: Need logging for errors sending string razorError = null; var result = AppUtils.RenderRazorTemplate("~/views/template/SearchNotificationTemplate.cshtml", model, razorError); which references a couple of helper functions that set up my RazorFolderHostContainer class:public static string RenderRazorTemplate(string virtualPath, object model,string errorMessage = null) { var razor = AppUtils.CreateRazorHost(); var path = virtualPath.Replace("~/", "").Replace("~", "").Replace("/", "\\"); var merged = razor.RenderTemplateToString(path, model); if (merged == null) errorMessage = razor.ErrorMessage; return merged; } /// <summary> /// Creates a RazorStringHostContainer and starts it /// Call .Stop() when you're done with it. /// /// This is a static instance /// </summary> /// <param name="virtualPath"></param> /// <param name="binBasePath"></param> /// <param name="forceLoad"></param> /// <returns></returns> public static RazorFolderHostContainer CreateRazorHost(string binBasePath = null, bool forceLoad = false) { if (binBasePath == null) { if (HttpContext.Current != null) binBasePath = HttpContext.Current.Server.MapPath("~/"); else binBasePath = AppDomain.CurrentDomain.BaseDirectory; } if (_RazorHost == null || forceLoad) { if (!binBasePath.EndsWith("\\")) binBasePath += "\\"; //var razor = new RazorStringHostContainer(); var razor = new RazorFolderHostContainer(); razor.TemplatePath = binBasePath; binBasePath += "bin\\"; razor.BaseBinaryFolder = binBasePath; razor.UseAppDomain = false; razor.ReferencedAssemblies.Add(binBasePath + "ClassifiedsBusiness.dll"); razor.ReferencedAssemblies.Add(binBasePath + "ClassifiedsWeb.dll"); razor.ReferencedAssemblies.Add(binBasePath + "Westwind.Utilities.dll"); razor.ReferencedAssemblies.Add(binBasePath + "Westwind.Web.dll"); razor.ReferencedAssemblies.Add(binBasePath + "Westwind.Web.Mvc.dll"); razor.ReferencedAssemblies.Add("System.Web.dll"); razor.ReferencedNamespaces.Add("System.Web"); razor.ReferencedNamespaces.Add("ClassifiedsBusiness"); razor.ReferencedNamespaces.Add("ClassifiedsWeb"); razor.ReferencedNamespaces.Add("Westwind.Web"); razor.ReferencedNamespaces.Add("Westwind.Utilities"); _RazorHost = razor; _RazorHost.Start(); //_RazorHost.Engine.Configuration.CompileToMemory = false; } return _RazorHost; } The RazorFolderHostContainer essentially is a full runtime that mimics a folder structure like a typical Web app does including caching semantics and compiling code only if code changes on disk. It maps a folder hierarchy to views using the ~/ path syntax. The host is then configured to add assemblies and namespaces. Unfortunately the engine is not exactly like MVC's Razor - the expression expansion and code execution are the same, but some of the support methods like sections, helpers etc. are not all there so templates have to be a bit simpler. There are other folder hosts provided as well to directly execute templates from strings (using RazorStringHostContainer). The following is an example of an HTML email template @inherits RazorHosting.RazorTemplateFolderHost <ClassifiedsWeb.SearchNotificationViewModel> <html> <head> <title>Search Notifications</title> <style> body { margin: 5px;font-family: Verdana, Arial; font-size: 10pt;} h3 { color: SteelBlue; } .entry-item { border-bottom: 1px solid grey; padding: 8px; margin-bottom: 5px; } </style> </head> <body> Hello @Model.User.Name,<br /> <p>Below are your Search Results for the search phrase:</p> <h3>@Model.Notification.SearchPhrase</h3> <small>since @TimeUtils.ShortDateString(Model.Notification.LastSearch)</small> <hr /> You can see that the syntax is a little different. Instead of the familiar @model header the raw Razor @inherits tag is used to specify the template base class (which you can extend). I took a quick look through the feature set of RazorEngine on CodePlex (now Github I guess) and the template implementation they use is closer to MVC's razor but there are other differences. In the end don't expect exact behavior like MVC templates if you use an external Razor rendering engine. This is not what I would consider an ideal solution, but it works well enough for this project. My biggest concern is the overhead of hosting a second razor engine in a Web app and the fact that here the differences in template rendering between 'real' MVC Razor views and another RazorEngine really are noticeable. You win some, you lose some It's extremely nice to see that if you have a ControllerContext handy (which probably addresses 99% of Web app scenarios) rendering a view to string using the native MVC Razor engine is pretty simple. Kudos on making that happen - as it solves a problem I see in just about every Web application I work on. But it is a bummer that a ControllerContext is required to make this simple code work. It'd be really sweet if there was a way to render views without being so closely coupled to the ASP.NET or MVC infrastructure that requires a ControllerContext. Alternately it'd be nice to have a way for an MVC based application to create a minimal ControllerContext from scratch - maybe somebody's been down that path. I tried for a few hours to come up with a way to make that work but gave up in the soup of nested contexts (MVC/Controller/View/Http). I suspect going down this path would be similar to hosting the ASP.NET runtime requiring a WorkerRequest. Brrr…. The sad part is that it seems to me that a View should really not require much 'context' of any kind to render output to string. Yes there are a few things that clearly are required like paths to the virtual and possibly the disk paths to the root of the app, but beyond that view rendering should not require much. But, no such luck. For now custom RazorHosting seems to be the only way to make Razor rendering go outside of the MVC context… Resources Full ViewRenderer.cs source code from Westwind.Web.Mvc library Hosting the Razor Engine for Non-Web Applications RazorEngine on GitHub© Rick Strahl, West Wind Technologies, 2005-2012Posted in ASP.NET ASP.NET MVC Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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Generating EF Code First model classes from an existing database

- by Jon Galloway

Entity Framework Code First is a lightweight way to "turn on" data access for a simple CLR class. As the name implies, the intended use is that you're writing the code first and thinking about the database later. However, I really like the Entity Framework Code First works, and I want to use it in existing projects and projects with pre-existing databases. For example, MVC Music Store comes with a SQL Express database that's pre-loaded with a catalog of music (including genres, artists, and songs), and while it may eventually make sense to load that seed data from a different source, for the MVC 3 release we wanted to keep using the existing database. While I'm not getting the full benefit of Code First - writing code which drives the database schema - I can still benefit from the simplicity of the lightweight code approach. Scott Guthrie blogged about how to use entity framework with an existing database, looking at how you can override the Entity Framework Code First conventions so that it can work with a database which was created following other conventions. That gives you the information you need to create the model classes manually. However, it turns out that with Entity Framework 4 CTP 5, there's a way to generate the model classes from the database schema. Once the grunt work is done, of course, you can go in and modify the model classes as you'd like, but you can save the time and frustration of figuring out things like mapping SQL database types to .NET types. Note that this template requires Entity Framework 4 CTP 5 or later. You can install EF 4 CTP 5 here. Step One: Generate an EF Model from your existing database The code generation system in Entity Framework works from a model. You can add a model to your existing project and delete it when you're done, but I think it's simpler to just spin up a separate project to generate the model classes. When you're done, you can delete the project without affecting your application, or you may choose to keep it around in case you have other database schema updates which require model changes. I chose to add the Model classes to the Models folder of a new MVC 3 application. Right-click the folder and select "Add / New Item..." Next, select ADO.NET Entity Data Model from the Data Templates list, and name it whatever you want (the name is unimportant). Next, select "Generate from database." This is important - it's what kicks off the next few steps, which read your database's schema. Now it's time to point the Entity Data Model Wizard at your existing database. I'll assume you know how to find your database - if not, I covered that a bit in the MVC Music Store tutorial section on Models and Data. Select your database, uncheck the "Save entity connection settings in Web.config" (since we won't be using them within the application), and click Next. Now you can select the database objects you'd like modeled. I just selected all tables and clicked Finish. And there's your model. If you want, you can make additional changes here before going on to generate the code. Step Two: Add the DbContext Generator Like most code generation systems in Visual Studio lately, Entity Framework uses T4 templates which allow for some control over how the code is generated. K Scott Allen wrote a detailed article on T4 Templates and the Entity Framework on MSDN recently, if you'd like to know more. Fortunately for us, there's already a template that does just what we need without any customization. Right-click a blank space in the Entity Framework model surface and select "Add Code Generation Item..." Select the Code groupt in the Installed Templates section and pick the ADO.NET DbContext Generator. If you don't see this listed, make sure you've got EF 4 CTP 5 installed and that you're looking at the Code templates group. Note that the DbContext Generator template is similar to the EF POCO template which came out last year, but with "fix up" code (unnecessary in EF Code First) removed. As soon as you do this, you'll two terrifying Security Warnings - unless you click the "Do not show this message again" checkbox the first time. It will also be displayed (twice) every time you rebuild the project, so I checked the box and no immediate harm befell my computer (fingers crossed!). Here's the payoff: two templates (filenames ending with .tt) have been added to the project, and they've generated the code I needed. The "MusicStoreEntities.Context.tt" template built a DbContext class which holds the entity collections, and the "MusicStoreEntities.tt" template build a separate class for each table I selected earlier. We'll customize them in the next step. I recommend copying all the generated .cs files into your application at this point, since accidentally rebuilding the generation project will overwrite your changes if you leave them there. Step Three: Modify and use your POCO entity classes Note: I made a bunch of tweaks to my POCO classes after they were generated. You don't have to do any of this, but I think it's important that you can - they're your classes, and EF Code First respects that. Modify them as you need for your application, or don't. The Context class derives from DbContext, which is what turns on the EF Code First features. It holds a DbSet for each entity. Think of DbSet as a simple List, but with Entity Framework features turned on. //------------------------------------------------------------------------------ // <auto-generated> // This code was generated from a template. // // Changes to this file may cause incorrect behavior and will be lost if // the code is regenerated. // </auto-generated> //------------------------------------------------------------------------------ namespace EF_CodeFirst_From_Existing_Database.Models { using System; using System.Data.Entity; public partial class Entities : DbContext { public Entities() : base("name=Entities") { } public DbSet<Album> Albums { get; set; } public DbSet<Artist> Artists { get; set; } public DbSet<Cart> Carts { get; set; } public DbSet<Genre> Genres { get; set; } public DbSet<OrderDetail> OrderDetails { get; set; } public DbSet<Order> Orders { get; set; } } } It's a pretty lightweight class as generated, so I just took out the comments, set the namespace, removed the constructor, and formatted it a bit. Done. If I wanted, though, I could have added or removed DbSets, overridden conventions, etc. using System.Data.Entity; namespace MvcMusicStore.Models { public class MusicStoreEntities : DbContext { public DbSet Albums { get; set; } public DbSet Genres { get; set; } public DbSet Artists { get; set; } public DbSet Carts { get; set; } public DbSet Orders { get; set; } public DbSet OrderDetails { get; set; } } } Next, it's time to look at the individual classes. Some of mine were pretty simple - for the Cart class, I just need to remove the header and clean up the namespace. //------------------------------------------------------------------------------ // // This code was generated from a template. // // Changes to this file may cause incorrect behavior and will be lost if // the code is regenerated. // //------------------------------------------------------------------------------ namespace EF_CodeFirst_From_Existing_Database.Models { using System; using System.Collections.Generic; public partial class Cart { // Primitive properties public int RecordId { get; set; } public string CartId { get; set; } public int AlbumId { get; set; } public int Count { get; set; } public System.DateTime DateCreated { get; set; } // Navigation properties public virtual Album Album { get; set; } } } I did a bit more customization on the Album class. Here's what was generated: //------------------------------------------------------------------------------ // // This code was generated from a template. // // Changes to this file may cause incorrect behavior and will be lost if // the code is regenerated. // //------------------------------------------------------------------------------ namespace EF_CodeFirst_From_Existing_Database.Models { using System; using System.Collections.Generic; public partial class Album { public Album() { this.Carts = new HashSet(); this.OrderDetails = new HashSet(); } // Primitive properties public int AlbumId { get; set; } public int GenreId { get; set; } public int ArtistId { get; set; } public string Title { get; set; } public decimal Price { get; set; } public string AlbumArtUrl { get; set; } // Navigation properties public virtual Artist Artist { get; set; } public virtual Genre Genre { get; set; } public virtual ICollection Carts { get; set; } public virtual ICollection OrderDetails { get; set; } } } I removed the header, changed the namespace, and removed some of the navigation properties. One nice thing about EF Code First is that you don't have to have a property for each database column or foreign key. In the Music Store sample, for instance, we build the app up using code first and start with just a few columns, adding in fields and navigation properties as the application needs them. EF Code First handles the columsn we've told it about and doesn't complain about the others. Here's the basic class: using System.ComponentModel; using System.ComponentModel.DataAnnotations; using System.Web.Mvc; using System.Collections.Generic; namespace MvcMusicStore.Models { public class Album { public int AlbumId { get; set; } public int GenreId { get; set; } public int ArtistId { get; set; } public string Title { get; set; } public decimal Price { get; set; } public string AlbumArtUrl { get; set; } public virtual Genre Genre { get; set; } public virtual Artist Artist { get; set; } public virtual List OrderDetails { get; set; } } } It's my class, not Entity Framework's, so I'm free to do what I want with it. I added a bunch of MVC 3 annotations for scaffolding and validation support, as shown below: using System.ComponentModel; using System.ComponentModel.DataAnnotations; using System.Web.Mvc; using System.Collections.Generic; namespace MvcMusicStore.Models { [Bind(Exclude = "AlbumId")] public class Album { [ScaffoldColumn(false)] public int AlbumId { get; set; } [DisplayName("Genre")] public int GenreId { get; set; } [DisplayName("Artist")] public int ArtistId { get; set; } [Required(ErrorMessage = "An Album Title is required")] [StringLength(160)] public string Title { get; set; } [Required(ErrorMessage = "Price is required")] [Range(0.01, 100.00, ErrorMessage = "Price must be between 0.01 and 100.00")] public decimal Price { get; set; } [DisplayName("Album Art URL")] [StringLength(1024)] public string AlbumArtUrl { get; set; } public virtual Genre Genre { get; set; } public virtual Artist Artist { get; set; } public virtual List<OrderDetail> OrderDetails { get; set; } } } The end result was that I had working EF Code First model code for the finished application. You can follow along through the tutorial to see how I built up to the finished model classes, starting with simple 2-3 property classes and building up to the full working schema. Thanks to Diego Vega (on the Entity Framework team) for pointing me to the DbContext template.

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XSLT 1.0 help with recursion logic

- by DashaLuna

Hello guys, I'm having troubles with the logic and would apprecite any help/tips. I have <Deposits> elements and <Receipts> elements. However there isn't any identification what receipt was paid toward what deposit. I am trying to update the <Deposits> elements with the following attributes: @DueAmont - the amount that is still due to pay @Status - whether it's paid, outstanding (partly paid) or due @ReceiptDate - the latest receipt's date that was paid towards this deposit Every deposit could be paid with one or more receipts. It also could happen, that 1 receipt could cover one or more deposits. For example. If there are 3 deposits: 500 100 450 That are paid with the following receipts: 200 100 250 I want to get the following info: Deposit 1 is fully paid (status=paid, dueAmount=0, receiptNum=3. Deposit 2 is partly paid (status=outstanding, dueAmount=50, receiptNum=3. Deposit 3 is not paid (status=due, dueAmount=450, receiptNum=NAN. I've added comments in the code explaining what I'm trying to do. I am staring at this code for the 3rd day now non stop - can't see what I'm doing wrong. Please could anyone help me with it? :) Thanks! Set up: $deposits - All the available deposits $receiptsAsc - All the available receipts sorted by their @ActionDate Code:  <xsl:variable name="depositsClassified"> <xsl:call-template name="classifyDeposits"> <xsl:with-param name="depositsAll" select="$deposits"/> <xsl:with-param name="receiptsAll" select="$receiptsAsc"/> <xsl:with-param name="receiptCount" select="'1'"/> </xsl:call-template> </xsl:variable>  <xsl:template name="classifyDeposits"> <xsl:param name="depositsAll"/> <xsl:param name="receiptsAll"/> <xsl:param name="receiptCount"/>  <xsl:if test="$depositsAll">  <xsl:variable name="deposit" select="$depositsAll[1]"/>  <xsl:variable name="receiptSum"> <xsl:choose> <xsl:when test="$receiptsAll"> <xsl:value-of select="sum($receiptsAll[position() <= $receiptCount]/@ReceiptAmount)"/> </xsl:when> <xsl:otherwise>0</xsl:otherwise> </xsl:choose> </xsl:variable>  <xsl:variable name="diff" select="$deposit/@DepositTotalAmount - $receiptSum"/> <xsl:choose>  <xsl:when test="($diff > 0) and ($receiptCount < count($receiptsAll))"> <xsl:call-template name="classifyDeposits"> <xsl:with-param name="depositsAll" select="$depositsAll"/> <xsl:with-param name="receiptsAll" select="$receiptsAll"/> <xsl:with-param name="receiptCount" select="$receiptCount + 1"/> </xsl:call-template> </xsl:when>  <xsl:otherwise>  <xsl:apply-templates select="$deposit" mode="defineDeposit"> <xsl:with-param name="diff" select="$diff"/> <xsl:with-param name="receiptNum" select="$receiptCount"/> </xsl:apply-templates>  <xsl:variable name="receiptsUpdatedRTF"> <xsl:for-each select="$receiptsAll"> <xsl:choose>  <xsl:when test="position() < $receiptCount"> <xsl:copy> <xsl:copy-of select="./@*"/> <xsl:attribute name="ReceiptAmount">0</xsl:attribute> </xsl:copy> </xsl:when>  <xsl:when test="position() = $receiptCount"> <xsl:copy> <xsl:copy-of select="./@*"/> <xsl:attribute name="ReceiptAmount"> <xsl:value-of select="format-number($diff, '#.00;#.00')"/> </xsl:attribute> </xsl:copy> </xsl:when>  <xsl:otherwise> <xsl:copy-of select="."/> </xsl:otherwise> </xsl:choose> </xsl:for-each> </xsl:variable> <xsl:variable name="receiptsUpdated" select="msxsl:node-set($receiptsUpdatedRTF)/Receipts"/>  <xsl:call-template name="classifyDeposits"> <xsl:with-param name="depositsAll" select="$deposits[position() != 1]"/> <xsl:with-param name="receiptsAll" select="$receiptsUpdated"/> <xsl:with-param name="receiptCount" select="$receiptCount"/> </xsl:call-template> </xsl:otherwise> </xsl:choose> </xsl:if> </xsl:template>  <xsl:template match="MultiDeposits" mode="defineDeposit"> <xsl:param name="diff"/> <xsl:param name="receiptNum"/> <xsl:choose> <xsl:when test="$diff <= 0"> <xsl:apply-templates select="." mode="addAttrs"> <xsl:with-param name="status" select="'paid'"/> <xsl:with-param name="dueAmount" select="'0'"/> <xsl:with-param name="receiptNum" select="$receiptNum"/> </xsl:apply-templates> </xsl:when> <xsl:when test="$diff = ./@DepositTotalAmount"> <xsl:apply-templates select="." mode="addAttrs"> <xsl:with-param name="status" select="'due'"/> <xsl:with-param name="dueAmount" select="$diff"/> </xsl:apply-templates> </xsl:when> <xsl:when test="$diff < ./@DepositTotalAmount"> <xsl:apply-templates select="." mode="addAttrs"> <xsl:with-param name="status" select="'outstanding'"/> <xsl:with-param name="dueAmount" select="$diff"/> <xsl:with-param name="receiptNum" select="$receiptNum"/> </xsl:apply-templates> </xsl:when> <xsl:otherwise/> </xsl:choose> </xsl:template>  <xsl:template match="MultiDeposits" mode="addAttrs"> <xsl:param name="status"/> <xsl:param name="dueAmount"/> <xsl:param name="receiptNum" select="''"/> <xsl:copy> <xsl:copy-of select="./@*"/> <xsl:attribute name="Status"><xsl:value-of select="$status"/></xsl:attribute> <xsl:attribute name="DueAmount"><xsl:value-of select="$dueAmount"/></xsl:attribute> <xsl:if test="$receiptNum != ''"> <xsl:attribute name="ReceiptDate"> <xsl:value-of select="$receiptsAsc[position() = $receiptNum]/@ActionDate"/> </xsl:attribute> </xsl:if> <xsl:copy-of select="./*"/> </xsl:copy> </xsl:template>

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How to group using XSLT

- by AdRock

I'm having trouble grouping a set of nodes. I've found an article that does work with grouping and i have tested it and it works on a small test stylesheet i have I now need to use it in my stylesheet where I only want to select node sets that have a specific value. What I want to do in my stylesheet is select all users who have a userlevel of 2 then to group them by the volunteer region. What happens at the minute is that it gets the right amount of users with userlevel 2 but doesn't print them. It just repeats the first user in the xml file. <?xml version="1.0" encoding="ISO-8859-1"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:key name="volunteers-by-region" match="volunteer" use="region" /> <xsl:template name="hoo" match="/"> <html> <head> <title>Registered Volunteers</title> <link rel="stylesheet" type="text/css" href="volunteer.css" /> </head> <body> <h1>Registered Volunteers</h1> <h3>Ordered by the username ascending</h3> <xsl:for-each select="folktask/member[user/account/userlevel='2']"> <xsl:for-each select="volunteer[count(. | key('volunteers-by-region', region)[1]) = 1]"> <xsl:sort select="region" /> <xsl:for-each select="key('volunteers-by-region', region)"> <xsl:sort select="folktask/member/user/personal/name" /> <div class="userdiv"> <xsl:call-template name="member_userid"> <xsl:with-param name="myid" select="/folktask/member/user/@id" /> </xsl:call-template> <xsl:call-template name="volunteer_volid"> <xsl:with-param name="volid" select="/folktask/member/volunteer/@id" /> </xsl:call-template> <xsl:call-template name="volunteer_role"> <xsl:with-param name="volrole" select="/folktask/member/volunteer/roles" /> </xsl:call-template> <xsl:call-template name="volunteer_region"> <xsl:with-param name="volloc" select="/folktask/member/volunteer/region" /> </xsl:call-template> </div> </xsl:for-each> </xsl:for-each> </xsl:for-each> <xsl:if test="position()=last()"> <div class="count"><h2>Total number of volunteers: <xsl:value-of select="count(/folktask/member/user/account/userlevel[text()=2])"/></h2></div> </xsl:if> </body> </html> </xsl:template> <xsl:template name="member_userid"> <xsl:param name="myid" select="'Not Available'" /> <div class="heading bold"><h2>USER ID: <xsl:value-of select="$myid" /></h2></div> </xsl:template> <xsl:template name="volunteer_volid"> <xsl:param name="volid" select="'Not Available'" /> <div class="heading2 bold"><h2>VOLUNTEER ID: <xsl:value-of select="$volid" /></h2></div> </xsl:template> <xsl:template name="volunteer_role"> <xsl:param name="volrole" select="'Not Available'" /> <div class="small bold">ROLES:</div> <div class="large"> <xsl:choose> <xsl:when test="string-length($volrole)!=0"> <xsl:value-of select="$volrole" /> </xsl:when> <xsl:otherwise> <xsl:text> </xsl:text> </xsl:otherwise> </xsl:choose> </div> </xsl:template> <xsl:template name="volunteer_region"> <xsl:param name="volloc" select="'Not Available'" /> <div class="small bold">REGION:</div> <div class="large"><xsl:value-of select="$volloc" /></div> </xsl:template> </xsl:stylesheet> here is my full xml file <?xml version="1.0" encoding="ISO-8859-1" ?> <?xml-stylesheet type="text/xsl" href="volunteers.xsl"?> <folktask xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="folktask.xsd"> <member> <user id="1"> <personal> <name>Abbie Hunt</name> <sex>Female</sex> <address1>108 Access Road</address1> <address2></address2> <city>Wells</city> <county>Somerset</county> <postcode>BA5 8GH</postcode> <telephone>01528927616</telephone> <mobile>07085252492</mobile> <email>[email protected]</email> </personal> <account> <username>AdRock</username> <password>269eb625e2f0cf6fae9a29434c12a89f</password> <userlevel>4</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="1"> <roles></roles> <region>South West</region> </volunteer> </member> <member> <user id="2"> <personal> <name>Aidan Harris</name> <sex>Male</sex> <address1>103 Aiken Street</address1> <address2></address2> <city>Chichester</city> <county>Sussex</county> <postcode>PO19 4DS</postcode> <telephone>01905149894</telephone> <mobile>07784467941</mobile> <email>[email protected]</email> </personal> <account> <username>AmbientExpert</username> <password>8e64214160e9dd14ae2a6d9f700004a6</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="2"> <roles>Van Driver,gas Fitter</roles> <region>South Central</region> </volunteer> </member> <member> <user id="3"> <personal> <name>Skye Saunders</name> <sex>Female</sex> <address1>31 Anns Court</address1> <address2></address2> <city>Cirencester</city> <county>Gloucestershire</county> <postcode>GL7 1JG</postcode> <telephone>01958303514</telephone> <mobile>07260491667</mobile> <email>[email protected]</email> </personal> <account> <username>BigUndecided</username> <password>ea297847f80e046ca24a8621f4068594</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="3"> <roles>Scaffold Erector</roles> <region>South West</region> </volunteer> </member> <member> <user id="4"> <personal> <name>Connor Lawson</name> <sex>Male</sex> <address1>12 Ash Way</address1> <address2></address2> <city>Swindon</city> <county>Wiltshire</county> <postcode>SN3 6GS</postcode> <telephone>01791928119</telephone> <mobile>07338695664</mobile> <email>[email protected]</email> </personal> <account> <username>iTuneStinker</username> <password>3a1f5fda21a07bfff20c41272bae7192</password> <userlevel>3</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <festival id="1"> <event> <eventname>Oxford Folk Festival</eventname> <url>http://www.oxfordfolkfestival.com/</url> <datefrom>2010-04-07</datefrom> <dateto>2010-04-09</dateto> <location>Oxford</location> <eventpostcode>OX1 9BE</eventpostcode> <additional>Oxford Folk Festival is going into it's third year in 2006. As well as needing volunteers to steward for the event on the weekend itself, we would be delighted to hear from people willing to help in year round festival work such as stuffing envelopes for mailings, poster and leaflet distribution, and stewarding duties at festival pre-events.</additional> <coords> <lat>51.735640</lat> <lng>-1.276136</lng> </coords> </event> <contact> <conname>Stuart Vincent</conname> <conaddress1>P.O. Box 642</conaddress1> <conaddress2></conaddress2> <concity>Oxford</concity> <concounty>Bedfordshire</concounty> <conpostcode>OX1 3BY</conpostcode> <contelephone>01865 79073</contelephone> <conmobile></conmobile> <fax></fax> <conemail>[email protected]</conemail> </contact> </festival> </member> <member> <user id="5"> <personal> <name>Lewis King</name> <sex>Male</sex> <address1>67 Arbors Way</address1> <address2></address2> <city>Sherborne</city> <county>Dorset</county> <postcode>DT9 0GS</postcode> <telephone>01446139701</telephone> <mobile>07292614033</mobile> <email>[email protected]</email> </personal> <account> <username>Runninglife</username> <password>98fab0a27c34ddb2b0618bc184d4331d</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="4"> <roles>Van Driver</roles> <region>South West</region> </volunteer> </member> <member> <user id="6"> <personal> <name>Cameron Lee</name> <sex>Male</sex> <address1>77 Arrington Road</address1> <address2></address2> <city>Solihull</city> <county>Warwickshire</county> <postcode>B90 6FG</postcode> <telephone>01435158624</telephone> <mobile>07789503179</mobile> <email>[email protected]</email> </personal> <account> <username>love2Mixer</username> <password>1df752d54876928639cea07ce036a9c0</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="5"> <roles>Fire Warden</roles> <region>Midlands</region> </volunteer> </member> <member> <user id="7"> <personal> <name>Lexie Dean</name> <sex>Female</sex> <address1>38 Bloomfield Court</address1> <address2></address2> <city>Windermere</city> <county>Westmorland</county> <postcode>LA23 8BM</postcode> <telephone>01781207188</telephone> <mobile>07127461231</mobile> <email>[email protected]</email> </personal> <account> <username>MailNetworker</username> <password>0e070701839e612bf46af4421db4f44b</password> <userlevel>3</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <festival id="2"> <event> <eventname>Middlewich Folk And Boat Festival</eventname> <url>http://midfest.org.uk/mfab/</url> <datefrom>2010-06-16</datefrom> <dateto>2010-06-18</dateto> <location>Middlewich</location> <eventpostcode>CW10 9BX</eventpostcode> <additional>We welcome stewards staying on campsite or boats.</additional> <coords> <lat>53.190562</lat> <lng>-2.444926</lng> </coords> </event> <contact> <conname>Festival Committee</conname> <conaddress1>PO Box 141</conaddress1> <conaddress2></conaddress2> <concity>Winsford</concity> <concounty>Cheshire</concounty> <conpostcode>CW10 9WB</conpostcode> <contelephone>07092 39050</contelephone> <conmobile>07092 39050</conmobile> <fax></fax> <conemail>[email protected]</conemail> </contact> </festival> </member> <member> <user id="8"> <personal> <name>Liam Chapman</name> <sex>Male</sex> <address1>99 Black Water Drive</address1> <address2></address2> <city>St.Austell</city> <county>Cornwall</county> <postcode>PL25 3GF</postcode> <telephone>01835629418</telephone> <mobile>07695179069</mobile> <email>[email protected]</email> </personal> <account> <username>GreenWimp</username> <password>1fe3df99a841dc4f723d21af89e0990f</password> <userlevel>1</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> </member> <member> <user id="9"> <personal> <name>Brandon Harrison</name> <sex>Male</sex> <address1>41 Arlington Way</address1> <address2></address2> <city>Dorchester</city> <county>Dorset</county> <postcode>DT1 3JS</postcode> <telephone>01293626735</telephone> <mobile>07277145760</mobile> <email>[email protected]</email> </personal> <account> <username>LovelyStar</username> <password>8b53b66f323aa5e6a083edb4fd44456b</password> <userlevel>1</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> </member> <member> <user id="10"> <personal> <name>Samuel Young</name> <sex>Male</sex> <address1>102 Bailey Hill Road</address1> <address2></address2> <city>Wolverhampton</city> <county>Staffordshire</county> <postcode>WV7 8HS</postcode> <telephone>01594531382</telephone> <mobile>07544663654</mobile> <email>[email protected]</email> </personal> <account> <username>GuruSassy</username> <password>00da02da6c143c3d136bf60b8bfcf43e</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="6"> <roles>Fire Warden</roles> <region>Midlands</region> </volunteer> </member> <member> <user id="11"> <personal> <name>Alexander Harris</name> <sex>Male</sex> <address1>93 Beguine Drive</address1> <address2></address2> <city>Winchester</city> <county>Hampshire</county> <postcode>S23 2FD</postcode> <telephone>01452496582</telephone> <mobile>07353867291</mobile> <email>[email protected]</email> </personal> <account> <username>GuitarExpert</username> <password>0102ad3740028e155925e9918ead3bde</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="7"> <roles>Scaffold Erector</roles> <region>North East</region> </volunteer> </member> <member> <user id="12"> <personal> <name>Tyler Mcdonald</name> <sex>Male</sex> <address1>44 Baker Road</address1> <address2></address2> <city>Bromley</city> <county>Kent</county> <postcode>BR1 2GD</postcode> <telephone>01918704546</telephone> <mobile>07314062451</mobile> <email>[email protected]</email> </personal> <account> <username>WildWish</username> <password>073220bb5e9a12ad202bb7d94dcc86f7</password> <userlevel>1</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> </member> <member> <user id="13"> <personal> <name>Skye Mason</name> <sex>Female</sex> <address1>56 Cedar Creek Church Road</address1> <address2></address2> <city>Bracknell</city> <county>Berkshire</county> <postcode>RG12 1AQ</postcode> <telephone>01787607618</telephone> <mobile>07540218868</mobile> <email>[email protected]</email> </personal> <account> <username>PizzaDork</username> <password>74c54937ee7051ee7f4ebc11296ed531</password> <userlevel>1</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> </member> <member> <user id="14"> <personal> <name>Maryam Rose</name> <sex>Female</sex> <address1>98 Baptist Circle</address1> <address2></address2> <city>Newbury</city> <county>Berkshire</county> <postcode>RG14 8DF</postcode> <telephone>01691317999</telephone> <mobile>07212477154</mobile> <email>[email protected]</email> </personal> <account> <username>SexTech</username> <password>f1c21f9f1e999da97d7dc460bb876fcf</password> <userlevel>3</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <festival id="3"> <event> <eventname>Birdsedge Village Festival</eventname> <url>http://www.birdsedge.co.uk/</url> <datefrom>2010-07-08</datefrom> <dateto>2010-07-09</dateto> <location>Birdsedge</location> <eventpostcode>HD8 8XT</eventpostcode> <additional></additional> <coords> <lat>53.565644</lat> <lng>-1.696196</lng> </coords> </event> <contact> <conname>Jacey Bedford</conname> <conaddress1>Penistone Road</conaddress1> <conaddress2>Birdsedge</conaddress2> <concity>Huddersfield</concity> <concounty>West Yorkshire</concounty> <conpostcode>HD8 8XT</conpostcode> <contelephone>01484 60623</contelephone> <conmobile></conmobile> <fax></fax> <conemail>[email protected]</conemail> </contact> </festival> </member> <member> <user id="15"> <personal> <name>Lexie Rogers</name> <sex>Female</sex> <address1>38 Bishop Road</address1> <address2></address2> <city>Matlock</city> <county>Derbyshire</county> <postcode>DE4 1BX</postcode> <telephone>01961168823</telephone> <mobile>07170855351</mobile> <email>[email protected]</email> </personal> <account> <username>ShipBurglar</username> <password>cc190488a95667cb117e20bc6c7c330e</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="8"> <roles>Gas Fitter</roles> <region>Midlands</region> </volunteer> </member> <member> <user id="16"> <personal> <name>Noah Parker</name> <sex>Male</sex> <address1>112 Canty Road</address1> <address2></address2> <city>Keswick</city> <county>Cumberland</county> <postcode>CA12 4TR</postcode> <telephone>01931272522</telephone> <mobile>07610026576</mobile> <email>[email protected]</email> </personal> <account> <username>AwsomeMoon</username> <password>50b770539bdf08543f15778fc7a6f188</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <volunteer id="9"> <roles>Van Driver</roles> <region>North West</region> </volunteer> </member> <member> <user id="17"> <personal> <name>Elliot Mitchell</name> <sex>Male</sex> <address1>102 Brown Loop</address1> <address2></address2> <city>Grimsby</city> <county>Lincolnshire</county> <postcode>OX16 4QP</postcode> <telephone>01212971319</telephone> <mobile>07544663654</mobile> <email>[email protected]</email> </personal> <account> <username>msBasher</username> <password>c38fad85badcdff6e3559ef38656305d</password> <userlevel>1</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> </member> <member> <user id="18"> <personal> <name>Scarlett Rose</name> <sex>Female</sex> <address1>93 Cedar Lane</address1> <address2></address2> <city>Stourbridge</city> <county>Warminster</county> <postcode>DY8 4NX</postcode> <telephone>01537477435</telephone> <mobile>07353867291</mobile> <email>[email protected]</email> </personal> <account> <username>MakeupWimp</username> <password>16a9b7910fc34304c1d1a6a1b0c31502</password> <userlevel>1</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> </member> <member> <user id="19"> <personal> <name>Katie Butler</name> <sex>Female</sex> <address1>44 Boulder Crest Road</address1> <address2></address2> <city>Bungay</city> <county>Suffolk</county> <postcode>NR35 1LT</postcode> <telephone>01419124094</telephone> <mobile>07314062451</mobile> <email>[email protected]</email> </personal> <account> <username>TomatoCrunch</username> <password>d7eba53443ec4ddcee69ed71b2023fc0</password> <userlevel>1</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> </member> <member> <user id="20"> <personal> <name>Jayden Richards</name> <sex>Male</sex> <address1>56 Corson Trail</address1> <address2></address2> <city>Sandy</city> <county>Bedfordshire</county> <postcode>SG19 6DF</postcode> <telephone>01882134438</telephone> <mobile>07540218868</mobile> <email>[email protected]</email> </personal> <account> <username>nightmareTwig</username> <password>8a9c08c7b6473493e8a5da15dd541025</password> <userlevel>3</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <festival id="4"> <event> <eventname>East Barnet Festival</eventname> <url>http://www.eastbarnetfestival.org.uk</url> <datefrom>2010-07-01</datefrom> <dateto>2010-07-03</dateto> <location>East Barnet</location> <eventpostcode>EN4 8TB</eventpostcode> <additional></additional> <coords> <lat>51.641556</lat> <lng>-0.163018</lng> </coords> </event> <contact> <conname>East Barnet Festival Commitee</conname> <conaddress1>Oak Hill Park</conaddress1> <conaddress2>Church Hill Road</conaddress2> <concity>East Barnet</concity> <concounty>Hertfordshire</concounty> <conpostcode>EN4 8TB</conpostcode> <contelephone>07071781745</contelephone> <conmobile>07071781745</conmobile> <fax></fax> <conemail>[email protected]</conemail> </contact> </festival> </member> <member> <user id="21"> <personal> <name>Abbie Jackson</name> <sex>Female</sex> <address1>98 Briarwood Lane</address1> <address2></address2> <city>Weymouth</city> <county>Dorset</county> <postcode>DT3 6TS</postcode> <telephone>01575629969</telephone> <mobile>07212477154</mobile> <email>[email protected]</email> </personal> <account> <username>CrazyBlockhead</username> <password>4ce56fb13d043be605037ace4fbd9fa5</password> <userlevel>2</u

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Core Data Model Design Question - Changing "Live" Objects also Changes Saved Objects

- by mwt

I'm working on my first Core Data project (on iPhone) and am really liking it. Core Data is cool stuff. I am, however, running into a design difficulty that I'm not sure how to solve, although I imagine it's a fairly common situation. It concerns the data model. For the sake of clarity, I'll use an imaginary football game app as an example to illustrate my question. Say that there are NSMO's called Downs and Plays. Plays function like templates to be used by Downs. The user creates Plays (for example, Bootleg, Button Hook, Slant Route, Sweep, etc.) and fills in the various properties. Plays have a to-many relationship with Downs. For each Down, the user decides which Play to use. When the Down is executed, it uses the Play as its template. After each down is run, it is stored in history. The program remembers all the Downs ever played. So far, so good. This is all working fine. The question I have concerns what happens when the user wants to change the details of a Play. Let's say it originally involved a pass to the left, but the user now wants it to be a pass to the right. Making that change, however, not only affects all the future executions of that Play, but also changes the details of the Plays stored in history. The record of Downs gets "polluted," in effect, because the Play template has been changed. I have been rolling around several possible fixes to this situation, but I imagine the geniuses of SO know much more about how to handle this than I do. Still, the potential fixes I've come up with are: 1) "Versioning" of Plays. Each change to a Play template actually creates a new, separate Play object with the same name (as far as the user can tell). Underneath the hood, however, it is actually a different Play. This would work, AFAICT, but seems like it could potentially lead to a wild proliferation of Play objects, esp. if the user keeps switching back and forth between several versions of the same Play (creating object after object each time the user switches). Yes, the app could check for pre-existing, identical Plays, but... it just seems like a mess. 2) Have Downs, upon saving, record the details of the Play they used, but not as a Play object. This just seems ridiculous, given that the Play object is there to hold those just those details. 3) Recognize that Play objects are actually fulfilling 2 functions: one to be a template for a Down, and the other to record what template was used. These 2 functions have a different relationship with a Down. The first (template) has a to-many relationship. But the second (record) has a one-to-one relationship. This would mean creating a second object, something like "Play-Template" which would retain the to-many relationship with Downs. Play objects would get reconfigured to have a one-to-one relationship with Downs. A Down would use a Play-Template object for execution, but use the new kind of Play object to store what template was used. It is this change from a to-many relationship to a one-to-one relationship that represents the crux of the problem. Even writing this question out has helped me get clearer. I think something like solution 3 is the answer. However if anyone has a better idea or even just a confirmation that I'm on the right track, that would be helpful. (Remember, I'm not really making a football game, it's just faster/easier to use a metaphor everyone understands.) Thanks.

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Where are the function address literals in c++?

- by academicRobot

First of all, maybe literals is not the right term for this concept, but its the closest I could think of (not literals in the sense of functions as first class citizens). <UPDATE> After some reading with help from answer by Chris Dodd, what I'm looking for is literal function addresses as template parameters. Chris' answer indicates how to do this for standard functions, but how can the addresses of member functions be used as template parameters? Since the standard prohibits non-static member function addresses as template parameters (c++03 14.3.2.3), I suspect the work around is quite complicated. Any ideas for a workaround? Below the original form of the question is left as is for context. </UPDATE> The idea is that when you make a conventional function call, it compiles to something like this: callq <immediate address> But if you make a function call using a function pointer, it compiles to something like this: mov <memory location>,%rax callq *%rax Which is all well and good. However, what if I'm writing a template library that requires a callback of some sort with a specified argument list and the user of the library is expected to know what function they want to call at compile time? Then I would like to write my template to accept a function literal as a template parameter. So, similar to template <int int_literal> struct my_template {...};` I'd like to write template <func_literal_t func_literal> struct my_template {...}; and have calls to func_literal within my_template compile to callq <immediate address>. Is there a facility in C++ for this, or a work around to achieve the same effect? If not, why not (e.g. some cataclysmic side effects)? How about C++0x or another language? Solutions that are not portable are fine. Solutions that include the use of member function pointers would be ideal. I'm not particularly interested in being told "You are a <socially unacceptable term for a person of low IQ>, just use function pointers/functors." This is a curiosity based question, and it seems that it might be useful in some (albeit limited) applications. It seems like this should be possible since function names are just placeholders for a (relative) memory address, so why not allow more liberal use (e.g. aliasing) of this placeholder. p.s. I use function pointers and functions objects all the the time and they are great. But this post got me thinking about the don't pay for what you don't use principle in relation to function calls, and it seems like forcing the use of function pointers or similar facility when the function is known at compile time is a violation of this principle, though a small one. Edit The intent of this question is not to implement delegates, rather to identify a pattern that will embed a conventional function call, (in immediate mode) directly into third party code, possibly a template.

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Configure TFS portal afterwards

Update #1 January 8th, 2010: There is an updated post on this topic for Beta 2: http://www.ewaldhofman.nl/post/2009/12/10/Configure-TFS-portal-afterwards-Beta-2.aspx Update #2 October 10th, 2010: In the new Team Foundation Server Power Tools September 2010, there is now a command to create a portal. tfpt addprojectportal Add or move portal for an existing team project Usage: tfpt addprojectportal /collection:uri /teamproject:"project name" /processtemplate:"template name" [/webapplication:"webappname"] [/relativepath:"pathfromwebapp"] [/validate] [/verbose] /collection Required. URL of Team Project Collection. /teamproject Required. Specifies the name of the team project. /processtemplate Required. Specifies that name of the process template. /webapplication The name of the SharePoint Web Application. Must also specify relativepath. /relativepath The path for the site relative to the root URL for the SharePoint Web Application. Must also specify webapplication. /validate Specifies that the user inputs are to be validated. If specified, only validation will be done and no portal setting will be changed. /verbose Switches on the verbose mode. I created a new Team Project in TFS 2010 Beta 1 and choose not to configure SharePoint during the creation of the Team Project. Of course I found out fairly quickly that a portal for TFS is very useful, especially the Iteration and the Product backlog workbooks and the dashboard reports. This blog describes how you can configure the sharepoint portal afterwards. Update: September 9th, 2009 Adding the portal afterwards is much easier as described below. Here are the steps Step 1: Create a new temporary project (with a SharePoint site for it). Open the Team Explorer Right click in the Team Explorer the root node (i.e. the project collection) Select "New team project" from the menu Walk throught he wizard and make sure you check the option to create the portal (which is by default checked) Step 2: Disable the site for the new project Open the Team Explorer Select the team project you created in step 1 In the menu click on Team -> Show Project Portal. In the menu click on Team -> Team Project Settings -> Portal Settings... The following dialog pops up Uncheck the option "Enable team project portal" Confirm the dialog with OK Step 3: Enable the site for the original one. Point it to the newly created site. Open the Team Explorer Select the team project you want to add the portal to In the menu open Team -> Team Project Settings -> Portal Settings... The same dialog as in step 2 pops up Check the option "Enable team project portal" Click on the "Configure URL" button The following dialog pops up In the dialog select in the combobox of the web application the TFS server Enter in the Relative site path the text "sites/[Project Collection Name]/[Team Project Name created in step 1]" Confirm the "Specify an existing SharePoint Site" with OK Check the "Reports and dashboards refer to data for this team project" option Confirm the dialog "Project Portal Settings" with OK Step 4: Delete the temporary project you created. In Beta 1, I have found no way to delete a team project. Maybe it will be available in TFS 2010 Beta 2. Original post Step 1: Create new portal site Go to the sharepoint site of your project collection (/sites//default.aspx">/sites//default.aspx">http://<servername>/sites/<project_collection_name>/default.aspx) Click on the Site Actions at the left side of the screen and choose the option Site Settings In the site settings, choose the Sites and workspaces option Create a new site Enter the values for the Title, the description, the site address. And choose for the TFS2010 Agile Dashboard as template. Create the site, by clicking on the Create button Step 2: Integrate portal site with team project Open Visual Studio Open the Team Explorer (View -> Team Explorer) Select in the Team Explorer tool window the Team Project for which you are create a new portal Open the Project Portal Settings (Team -> Team Project Settings -> Portal Setings...) Check the Enable team project portal checkbox Click on Configure URL... You will get a new dialog as below Enter the url to the TFS server in the web application combobox And specify the relative site path: sites/<project collection>/<site name> Confirm with OK Check in the Project Portal Settings dialog the checkbox "Reports and dashboards refer to data for this team project" Confirm the settings with OK (this takes a while...) When you now browse to the portal, you will see that the dashboards are now showing up with the data for the current team project. Step 3: Download process template To get a copy of the documents that are default in a team project, we need to have a fresh set of files that are not attached to a team project yet. You can do that with the following steps. Start the Process Template Manager (Team -> Team Project Collection Settings -> Process Template Manager...) Choose the Agile process template and click on download Choose a folder to download Step 4: Add Product and Iteration backlog Go to the Team Explorer in Visual Studio Make sure the team project is in the list of team projects, and expand the team project Right click the Documents node, and choose New Document Library Enter "Shared Documents", and click on Add Right click the Shared Documents node and choose Upload Document Go the the file location where you stored the process template from step 3 and then navigate to the subdirectory "Agile Process Template 5.0\MSF for Agile Software Development v5.0\Windows SharePoint Services\Shared Documents\Project Management" Select in the Open Dialog the files "Iteration Backlog" and "Product Backlog", and click Open Step 5: Bind Iteration backlog workbook to the team project Right click on the "Iteration Backlog" file and select Edit, and confirm any warning messages Place your cursor in cell A1 of the Iteration backlog worksheet Switch to the Team ribbon and click New List. Select your Team Project and click Connect From the New List dialog, select the Iteration Backlog query in the Workbook Queries folder. The final step is to add a set of document properties that allow the workbook to communicate with the TFS reporting warehouse. Before we create the properties we need to collect some information about your project. The first piece of information comes from the table created in the previous step. As you collect these properties, copy them into notepad so they can be used in later steps. Property How to retrieve the value? [Table name] Switch to the Design ribbon and select the Table Name value in the Properties portion of the ribbon [Project GUID] In the Visual Studio Team Explorer, right click your Team Project and select Properties. Select the URL value and copy the GUID (long value with lots of characters) at the end of the URL [Team Project name] In the Properties dialog, select the Name field and copy the value [TFS server name] In the Properties dialog, select the Server Name field and copy the value [UPDATE] I have found that this is not correct: you need to specify the instance of your SQL Server. The value is used to create a connection to the TFS cube. Switch back to the Iteration Backlog workbook. Click the Office button and select Prepare – Properties. Click the Document Properties – Server drop down and select Advanced Properties. Switch to the Custom tab and add the following properties using the values you collected above. Variable name Value [Table name]_ASServerName [TFS server name] [Table name]_ASDatabase tfs_warehouse [Table name]_TeamProjectName [Team Project name] [Table name]_TeamProjectId [Project GUID] Click OK to close the properties dialog. It is possible that the Estimated Work (Hours) is showing the #REF! value. To resolve that change the formula with: =SUMIFS([Table name][Original Estimate]; [Table name][Iteration Path];CurrentIteration&"*";[Table name][Area Path];AreaPath&"*";[Table name][Work Item Type]; "Task") For example =SUMIFS(VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Original Estimate]; VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Iteration Path];CurrentIteration&"*";VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Area Path];AreaPath&"*";VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Work Item Type]; "Task") Also the Total Remaining Work in the Individual Capacity table may contain #REF! values. To resolve that change the formula with: =SUMIFS([Table name][Remaining Work]; [Table name][Iteration Path];CurrentIteration&"*";[Table name][Area Path];AreaPath&"*";[Table name][Assigned To];[Team Member];[Table name][Work Item Type]; "Task") For example =SUMIFS(VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Remaining Work]; VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Iteration Path];CurrentIteration&"*";VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Area Path];AreaPath&"*";VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Assigned To];[Team Member];VSTS_ab392b55_6647_439a_bae4_8c66e908bc0d[Work Item Type]; "Task") Save and close the workbook. Step 6: Bind Product backlog workbook to the team project Repeat the steps for binding the Iteration backlog for thiw workbook too. In the worksheet Capacity, the formula of the Storypoints might be missing. You can resolve it with: =IF([Iteration]="";"";SUMIFS([Table name][Story Points];[Table name][Iteration Path];[Iteration]&"*")) Example =IF([Iteration]="";"";SUMIFS(VSTS_487f1e4c_db30_4302_b5e8_bd80195bc2ec[Story Points];VSTS_487f1e4c_db30_4302_b5e8_bd80195bc2ec[Iteration Path];[Iteration]&"*"))

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