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• Django + FastCGI - randomly raising OperationalError

  - by ibz

  I'm running a Django application. Had it under Apache + mod_python before, and it was all OK. Switched to Lighttpd + FastCGI. Now I randomly get the following exception (neither the place nor the time where it appears seem to be predictable). Since it's random, and it appears only after switching to FastCGI, I assume it has something to do with some settings. Found a few results when googleing, but they seem to be related to setting maxrequests=1. However, I use the default, which is 0. Any ideas where to look for? PS. I'm using PostgreSQL. Might be related to that as well, since the exception appears when making a database query. Thanks. File "/usr/lib/python2.6/site-packages/django/core/handlers/base.py", line 86, in get_response response = callback(request, *callback_args, **callback_kwargs) File "/usr/lib/python2.6/site-packages/django/contrib/admin/sites.py", line 140, in root if not self.has_permission(request): File "/usr/lib/python2.6/site-packages/django/contrib/admin/sites.py", line 99, in has_permission return request.user.is_authenticated() and request.user.is_staff File "/usr/lib/python2.6/site-packages/django/contrib/auth/middleware.py", line 5, in __get__ request._cached_user = get_user(request) File "/usr/lib/python2.6/site-packages/django/contrib/auth/__init__.py", line 83, in get_user user_id = request.session[SESSION_KEY] File "/usr/lib/python2.6/site-packages/django/contrib/sessions/backends/base.py", line 46, in __getitem__ return self._session[key] File "/usr/lib/python2.6/site-packages/django/contrib/sessions/backends/base.py", line 172, in _get_session self._session_cache = self.load() File "/usr/lib/python2.6/site-packages/django/contrib/sessions/backends/db.py", line 16, in load expire_date__gt=datetime.datetime.now() File "/usr/lib/python2.6/site-packages/django/db/models/manager.py", line 93, in get return self.get_query_set().get(*args, **kwargs) File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 304, in get num = len(clone) File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 160, in __len__ self._result_cache = list(self.iterator()) File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 275, in iterator for row in self.query.results_iter(): File "/usr/lib/python2.6/site-packages/django/db/models/sql/query.py", line 206, in results_iter for rows in self.execute_sql(MULTI): File "/usr/lib/python2.6/site-packages/django/db/models/sql/query.py", line 1734, in execute_sql cursor.execute(sql, params) OperationalError: server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request.

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• How to find the data key on CheckedChanged event of checkbox in ListView in ASP.NET?

  - by subodh

  I am using a list view inside that in item template i am using a label and a checkbox. I want that whenever user clicks on the check box the value should be updated in a table.i am using a datakeys in listview.on the basis of datakey value should be updated in the table. Query is: string updateQuery = "UPDATE [TABLE] SET [COLUMN] = " + Convert.ToInt32(chk.Checked) + " WHERE PK_ID =" + dataKey + " ";` also i want some help in displaying the result as it is inside the table.means if the value for column in table for a particular pkid is 1 then the checkbox shoul be checked. Here is the code snippet: <asp:ListView ID="lvFocusArea" runat="server" DataKeyNames="PK_ID" OnItemDataBound="lvFocusArea_ItemDataBound"> <LayoutTemplate> <table border="0" cellpadding="1" width="400px"> <tr style="background-color: #E5E5FE"> <th align="left"> Focus Area </th> <th> Is Current Focused </th> </tr> <tr id="itemPlaceholder" runat="server"> </tr> </table> </LayoutTemplate> <ItemTemplate> <tr> <td width="80%"> <asp:Label ID="lblFocusArea" runat="server" Text=""><%#Eval("FOCUS_AREA_NAME") %></asp:Label> </td> <td align="center" width="20%"> <asp:CheckBox ID="chkFocusArea" runat="server" OnCheckedChanged="chkFocusArea_CheckedChanged" AutoPostBack="true" /> </td> </tr> </ItemTemplate> <AlternatingItemTemplate> <tr style="background-color: #EFEFEF"> <td> <asp:Label ID="lblFocusArea" runat="server" Text=""><%#Eval("FOCUS_AREA_NAME") %></asp:Label> </td> <td align="center"> <asp:CheckBox ID="chkFocusArea" runat="server" OnCheckedChanged="chkFocusArea_CheckedChanged" AutoPostBack="true" /> </td> </tr> </AlternatingItemTemplate> <SelectedItemTemplate> <td> item selected </td> </SelectedItemTemplate> </asp:ListView> Help me.

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• AccessViolationException thrown

  - by user255371

  Hi, I’m working on a project that’s written in C# and uses a C++ dll to communicate with a robot. Originally the software was written in C# VS 2003 and was converted to VS 2008 (no change to the code) using .Net 2.0. Now, I started seeing the “Attempted to read or write protected memory…” on some computers. The Access violation error is always thrown when the code calls a particular method from the dll, however, that very same method is called over and over throughout the task and executes fine, just sometimes it throws the error. Also, the robot seems to execute the command fine which tells me that the values passed into the dll exist and thus are accessible. The software with the .Net 1.1 has been used for years and worked fine without ever throwing any memory errors. Now that it has been using .Net 2.0 it throws errors on some computers only. I’m not sure what’s causing the issue. I ruled out inappropriate calling (incorrect marshalling …) of the dll methods as it has been working fine with .Net 1.1 for years and thus should work fine in .Net 2.0 as well. I’ve seen some posts suggesting that it could be the GC, but then again why would it only happen on this one computer and only sometimes. Also, the values passed in are all global variables in the C# code and thus they should exist until the application is shut down and GC has no business moving any of those around or deleting them. Another observation, as I mentioned above, the robot executes the command normally which means that it gets all its necessary values. Not sure what the C++ dll’s method would do at the end where the GC could mess up stuff. It shouldn’t try to delete the global variables passed in and the method is not modifying those variables either (I’m not expecting any return values through the passed in values, the only return value is the method return which again shouldn’t have anything to do with GC.) One important piece of information I should add is that I have no access to the C++ code and thus cannot make any changes there. The fix has to come through the C# code or some settings on the computer or something else that I am in control of. Any help greatly appreciated. Thanks. Code snippet: Original method call in VS 2003 [DllImport("TOOLB32.dll",EntryPoint="TbxMoveWash")] public static extern int TbxMoveWash(int tArmId, string lpszCarrierRackId, int eZSelect, int[] lpTipSet, int tVol, bool bFastW); which I modified after seeing the error to the following (but the error still occurs): [DllImport("TOOLB32.dll",EntryPoint="TbxMoveWash")] public static extern int TbxMoveWash(int tArmId, string lpszCarrierRackId, int eZSelect, [MarshalAs(UnmanagedType.LPArray, SizeConst = 8)] int[] lpTipSet, int tVol, bool bFastW);

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• Best practices for sending automated daily emails from web service

  - by Tauren

  I am running a web service that currently sends confirmation emails out to new users via the gmail smtp servers. As I'm only getting a few new users each day, this hasn't been a problem. I've recently added new features to the webapp that will require a customized message to be sent out to each user every day. Think of this as similar to the regular messages LinkedIn sends out that give you a status report on the activity in your network. Every user's message will be different. With thousands of users, this means thousands of unique messages will be sent each day. Edit: I've since found that these types of email are called "transactional or relationship messages". Spamtacular has a good article on differentiating between marketing and transactional email. I don't think using gmail's smtp servers will cut it anymore, but I don't know that for sure. I don't know what gmail's maximum outgoing messages per account is (it might be 100/day), but they limit outgoing mail to 500 recipients per message. I'm not sending a single message to 500 recipients, but I'm going to be sending 1000's of customized messages with each recipient getting one per day. I'm interested to learn any best practices for doing this (especially for Java-based webapps). Here are some of my thoughts and concerns on it: Should I set up my own outgoing mail server? If I do this, it seems like I'll have all sorts of other issues to worry about, such as preventing mail server abuse, monitoring bounces, allowing ways to opt-out of emails, etc. Are there any tools or services to help with this? Maybe something like OpenEMM or a services like MailChimp? But those seem focused more toward email marketing campaigns. I don't think I should have the webapp itself handle sending emails as it currently is for new user signups. I'm thinking I should setup a separate messaging server that can access the same backend/datastore as the webapp. Thoughts on this? Should I consider setting up some sort of message queueing service to help with this, such as JMS, RabbitMQ, ActiveMQ, etc.? Do I need to provide users a way to opt-out? Do I need to flag these as bulk messages? I don't really consider these email marketing messages, but I'm unsure what is considered appropriate or proper netiquette. Any advice is appreciated. I'm also very interested in open source tools or web services that simplify things and could help me to ramp up as quickly as possible. Thanks!

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• decrypt an encrypted value ?

  - by jim

  I have an old Paradox database (I can convert it to Access 2007) which contains more then 200,000 records. This database has two columns: the first one is named "Word" and the second one is named "Mean". It is a dictionary database and my client wants to convert this old database to ASP.NET and SQL. However, we don't know what key or method is used to encrypt or encode the "Mean" column which is in the Unicode format. The software itself has been written in Delphi 7 and we don't have the source code. My client only knows the credentials for logging in to database. The problem is decoding the Mean column. What I do have is the compiled windows application and the Paradox database. This software can decode the "Mean" column for each "Word" so the method and/or key is in its own compiled code(.exe) or one of the files in its directory. For example, we know that in the following row the "Zymurgy" exactly means "???? ??? ????? ?? ???? ????, ????? ?????" since the application translates it like that. Here is what the record looks like when I open the database in Access: Word Mean Zymurgy 5OBnGguKPdDAd7L2lnvd9Lnf1mdd2zDBQRxngsCuirK5h91sVmy0kpRcue/+ql9ORmP99Mn/QZ4= Therefore we're trying to discover how the value in the Mean column is converted to "???? ??? ????? ?? ???? ????, ????? ?????". I think the "Mean" column value in above row is encoded in Base64 string format, but decoding the Base64 string does not yet result in the expected text. The extensions for files in the win app directory are dll, CCC, DAT, exe (other than the main app file), SYS, FAM, MB, PX, TV, VAL. Any kind of help is appreciated. Additional information: guys! the creators are not that stupid to save the values only in encoded form. they're definitely encrypted them. so i guess we have to look for the key.

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• Why aren't the :locals hash variables being passed in to a partial, when called from inside my rake

  - by marshally

  I need to render a bunch of painfully long running partials using a rake task. When I try to pull the partial from a rake task, I get the dreaded "Called id for nil, which would mistakenly be 4" error, which usually means that my locals hash has not been properly set into the partial. Here's the rake task (some variable names have been changed to protect the innocent): namespace :precache do desc "Precache stuff" task :precache => :environment do av = ActionView::Base.new(Rails::Configuration.new.view_path, {}) av.class_eval do include ApplicationHelper end @user = User.find(21) @rank = Rank.find(2) data = av.render(:partial => "reports/listing", :locals => {:user => @user, :rank => @rank}) end end And this is the error that I am getting: ** Execute precache:precache rake aborted! Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id On line #1 of app/views/reports/listing.html.erb 1: <%- @rid = @rank.id %> 2: <%- @cid = @user.id %> 3: <%- cache(:action => 'reports', :key => [arg1, arg2, arg3] ) do %> 4: <%- app/views/reports/_downline_js.html.erb:1 lib/tasks/precache_fragments.rake:12 rake (0.8.7) lib/rake.rb:636:in `call' rake (0.8.7) lib/rake.rb:636:in `execute' rake (0.8.7) lib/rake.rb:631:in `each' rake (0.8.7) lib/rake.rb:631:in `execute' rake (0.8.7) lib/rake.rb:597:in `invoke_with_call_chain' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' rake (0.8.7) lib/rake.rb:590:in `invoke_with_call_chain' rake (0.8.7) lib/rake.rb:583:in `invoke' rake (0.8.7) lib/rake.rb:2051:in `invoke_task' rake (0.8.7) lib/rake.rb:2029:in `top_level' rake (0.8.7) lib/rake.rb:2029:in `each' rake (0.8.7) lib/rake.rb:2029:in `top_level' rake (0.8.7) lib/rake.rb:2068:in `standard_exception_handling' rake (0.8.7) lib/rake.rb:2023:in `top_level' rake (0.8.7) lib/rake.rb:2001:in `run' rake (0.8.7) lib/rake.rb:2068:in `standard_exception_handling' rake (0.8.7) lib/rake.rb:1998:in `run' rake (0.8.7) bin/rake:31 /usr/bin/rake:19:in `load' /usr/bin/rake:19 details: I'm using Rails 2.3.5 and Ruby 1.8.7. Developing on Mac OSX. Eventually I will be deploying to Heroku.

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• Client-side templating frameworks to streamline using jQuery with REST/JSON

  - by Tauren

  I'm starting to migrate some html generation tasks from a server-side framework to the client. I'm using jQuery on the client. My goal is to get JSON data via a REST api and use this data to populate HTML into the page. Right now, when a user on my site clicks a link to My Projects, the server generates HTML like this: <dl> <dt>Clean Toilet</dt> <dd>Get off your butt and clean this filth!</dd> <dt>Clean Car</dt> <dd>I think there's something growing in there...</dd> <dt>Replace Puked on Baby Sheets</dt> </dl> I'm changing this so that clicking My Projects will now do a GET request that returns something like this: [ { "name":"Clean Car", "description":"I think there's something growing in there..." }, { "name":"Clean Toilets", "description":"Get off your butt and clean this filth!" }, { "name":"Replace Puked on Baby Sheets" } ] I can certainly write custom jQuery code to take that JSON and generate the HTML from it. This is not my question, and I don't need advice on how to do that. What I'd like to do is completely separate the presentation and layout from the logic (jquery code). I don't want to be creating DL, DT, and DD elements via jQuery code. I'd rather use some sort of HTML templates that I can fill the data in to. These templates could simply be HTML snippets that are hidden in the page that the application was loaded from. Or they could be dynamically loaded from the server (to support user specific layouts, i18n, etc.). They could be displayed a single time, as well as allow looping and repeating. Perhaps it should support sub-templates, if/then/else, and so forth. I have LOTS of lists and content on my site that are presented in many different ways. I'm looking to create a simple and consistent way to generate and display content without creating custom jQuery code for every different feature on my site. To me, this means I need to find or build a small framework on top of jQuery (probably as a plugin) that meets these requirements. The only sort of framework that I've found that is anything like this is jTemplates. I don't know how good it is, as I haven't used it yet. At first glance, I'm not thrilled by it's template syntax. Anyone know of other frameworks or plugins that I should look into? Any blog posts or other resources out there that discuss doing this sort of thing? I just want to make sure that I've surveyed everything out there before building it myself. Thanks!

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• Linq query challenge

  - by vdh_ant

  My table structure is as follows: Person 1-M PesonAddress Person 1-M PesonPhone Person 1-M PesonEmail Person 1-M Contract Contract M-M Program Contract M-1 Organization At the end of this query I need a populated object graph where each person has their: PesonAddress's PesonPhone's PesonEmail's PesonPhone's Contract's - and this has its respective Program's Now I had the following query and I thought that it was working great, but it has a couple of problems: from people in ctx.People.Include("PersonAddress") .Include("PersonLandline") .Include("PersonMobile") .Include("PersonEmail") .Include("Contract") .Include("Contract.Program") where people.Contract.Any( contract => (param.OrganizationId == contract.OrganizationId) && contract.Program.Any( contractProgram => (param.ProgramId == contractProgram.ProgramId))) select people; The problem is that it filters the person to the criteria but not the Contracts or the Contract's Programs. It brings back all Contracts that each person has not just the ones that have an OrganizationId of x and the same goes for each of those Contract's Programs respectively. What I want is only the people that have at least one contract with an OrgId of x with and where that contract has a Program with the Id of y... and for the object graph that is returned to have only the contracts that match and programs within that contract that match. I kinda understand why its not working, but I don't know how to change it so it is working... This is my attempt thus far: from people in ctx.People.Include("PersonAddress") .Include("PersonLandline") .Include("PersonMobile") .Include("PersonEmail") .Include("Contract") .Include("Contract.Program") let currentContracts = from contract in people.Contract where (param.OrganizationId == contract.OrganizationId) select contract let currentContractPrograms = from contractProgram in currentContracts let temp = from x in contractProgram.Program where (param.ProgramId == contractProgram.ProgramId) select x where temp.Any() select temp where currentContracts.Any() && currentContractPrograms.Any() select new Person { PersonId = people.PersonId, FirstName = people.FirstName, ..., ...., MiddleName = people.MiddleName, Surname = people.Surname, ..., ...., Gender = people.Gender, DateOfBirth = people.DateOfBirth, ..., ...., Contract = currentContracts, ... }; //This doesn't work But this has several problems (where the Person type is an EF object): I am left to do the mapping by myself, which in this case there is quite a lot to map When ever I try to map a list to a property (i.e. Scholarship = currentScholarships) it says I can't because IEnumerable is trying to be cast to EntityCollection Include doesn't work Hence how do I get this to work. Keeping in mind that I am trying to do this as a compiled query so I think that means anonymous types are out.

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• Why does Visual Studio 2010 throw this error with Boost 1.42.0?

  - by ra170

  I'm trying to recompile application, that compiles fine with warning level 4 in visual studio 2005 and visual studio 2008. Since the errors (look below) are coming from std:tr1, I'm thinking there's some conflict, but not sure how to fix. My first thought was to remove all references to boost, such as but then I get an error that it can't find format method. So here's one of the errors: (not sure what it means) Any ideas, suggestions, solutions? Thanks! > c:\program files (x86)\microsoft > visual studio > 10.0\vc\include\type_traits(197): error C2752: > 'std::tr1::_Remove_reference<_Ty>' : > more than one partial specialization > matches the template argument list 1> > with 1> [ 1> > _Ty=bool (__cdecl &)(const BlahBlah &) 1> ] 1> c:\program > files (x86)\microsoft visual studio > 10.0\vc\include\xtr1common(356): could be > 'std::tr1::_Remove_reference<_Ty&&>' > 1> c:\program files > (x86)\microsoft visual studio > 10.0\vc\include\xtr1common(350): or 'std::tr1::_Remove_reference<_Ty&>' 1> > c:\program files (x86)\microsoft > visual studio > 10.0\vc\include\type_traits(962) : see reference to class template > instantiation > 'std::tr1::remove_reference<_Ty>' > being compiled 1> with

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• Using QT to build a WYSIWYG Editor for a Custom Markup Language

  - by Aaron

  I'm new to QT, and am trying to figure out the best means of creating a WYSIWYG editor widget for a custom markup language that displays simple text, images, and links. I need to be able to propagate changes from the WYSIWYG editor to the custom markup representation. As a concrete example of the problem domain, imagine that the custom markup might have a "player" tag which contains a player name and a team name. The markup could look like this: Last week, <player id="1234"><name>Aaron Rodgers</name><team>Packers</team></player> threw a pass. This text would display in the editor as: Last week, Aaron Rodgers of the Packers threw a pass. The player name and the team name would be editable directly within the editor in standard WYSIWYG fashion, so that my users do not have to learn any markup. Also, when the player name is moused-over, a details pop-up will appear about that player, and similarly for the team. With that long introduction, I'm trying to figure out where to start with QT. It seems that the most logical option would be the Rich Text API using a QTextDocument. This approach seems less than ideal given the limitations of a QTextDocument: I can't figure out how to capture navigation events from clicking on links. Following links on click seems to only be enabled when the QTextEdit is readonly. Custom objects that implement QTextObjectInterface are ignored in copy-and-paste operations Any HTML-based markup that is passed to it as Rich Text is retranslated into a series of span tags and lots of other junk, making it extremely difficult to propagate changes from the editor back to the original custom markup. A second option appears to be QWebKit, which allows for live editing of HTML5 markup, so I could specify a two-way translation between the custom markup and HTML5. I'm not clear on how one would propagate changes from the editor back to the original markup in real-time without re-translating the entire document on every text change. The QWebKit solutions looks like awfully bulky to me (Learning WebKit along with QT) to what should be a relatively simple problem. I have also considered implementing the WYSIWYG with a custom class using native QT containers, labels, images, and other widgets manually. This seems like the most flexible approach, and the one most likely not to run into unresolvable problems. However, I'm pretty sure that implementing all the details of a normal text editor (selecting text, font changes, cut-and-paste support, undo/redo, dragging of objects, cursor placement, etc.) will be incredibly time consuming. So, finally, my question: are there any QT gurus out there with some advice on where to start with this sort of project? BTW, I am using QT because the application is a desktop application that needs platform independence.

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• Tiling rectangles seamlessly in WPF

  - by Joe White

  I want to seamlessly tile a bunch of different-colored Rectangles in WPF. That is, I want to put a bunch of rectangles edge-to-edge, and not have gaps between them. If everything is aligned to pixels, this works fine. But I also want to support arbitrary zoom, and ideally, I don't want to use SnapsToDevicePixels (because it would compromise quality when the image is zoomed way out). But that means my Rectangles sometimes render with gaps. For example: <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Background="Black"> <Canvas SnapsToDevicePixels="False"> <Canvas.RenderTransform> <ScaleTransform ScaleX="0.5" ScaleY="0.5"/> </Canvas.RenderTransform> <Rectangle Canvas.Left="25" Width="100" Height="100" Fill="#CFC"/> <Rectangle Canvas.Left="125" Width="100" Height="100" Fill="#CCF"/> </Canvas> </Page> If the ScaleTransform's ScaleX is 1, then the Rectangles fit together seamlessly. When it's 0.5, there's a dark gray streak between them. I understand why -- the combined semi-transparent edge pixels don't combine to be 100% opaque. But I would like a way to fix it. I could always just make the Rectangles overlap, but I won't always know in advance what patterns they'll be in (this is for a game that will eventually support a map editor). Besides, this would cause artifacts around the overlap area when things were zoomed way in (unless I did bevel-cut angles on the underlapping portion, which is an awful lot of work, and still causes problems at corners). Is there some way I can combine these Rectangles into a single combined "shape" that does render without internal gaps? I've played around with GeometryDrawing, which does exactly that, but then I don't see a way to paint each RectangleGeometry with a different-colored brush. Are there any other ways to get shapes to tile seamlessly under an arbitrary transform, without resorting to SnapsToDevicePixels?

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• RIA Services Repository Save does not work!?

  - by Savvas Sopiadis

  Hello everybody! Doing my first SL4 MVVM RIA based application and i ran into the following situation: updating a record (EF4,NO-POCOS!!) in the SL-client seems to take place, but values in the dbms are unchanged. Debugging with Fiddler the message on save is (amongst others): EntityActions.nil? b9http://schemas.microsoft.com/2003/10/Serialization/Arrays^HasMemberChanges?^Id?^ Operation?Update I assume that this says only: hey! the dbms should do an update on this record, AND nothing more! Is that right?! I 'm using a generic repository like this: public class Repository<T> : IRepository<T> where T : class { IObjectSet<T> _objectSet; IObjectContext _objectContext; public Repository(IObjectContext objectContext) { this._objectContext = objectContext; _objectSet = objectContext.CreateObjectSet<T>(); } public IQueryable<T> AsQueryable() { return _objectSet; } public IEnumerable<T> GetAll() { return _objectSet.ToList(); } public IEnumerable<T> Find(Expression<Func<T, bool>> where) { return _objectSet.Where(where); } public T Single(Expression<Func<T, bool>> where) { return _objectSet.Single(where); } public T First(Expression<Func<T, bool>> where) { return _objectSet.First(where); } public void Delete(T entity) { _objectSet.DeleteObject(entity); } public void Add(T entity) { _objectSet.AddObject(entity); } public void Attach(T entity) { _objectSet.Attach(entity); } public void Save() { _objectContext.SaveChanges(); } } The DomainService Update Method is the following: [Update] public void UpdateCulture(Culture currentCulture) { if (currentCulture.EntityState == System.Data.EntityState.Detached) { this.cultureRepository.Attach(currentCulture); } this.cultureRepository.Save(); } I know that the currentCulture-Entity is detached. What confuses me (amongst other things) is this: is the _objectContext still alive? (which means it "will be"??? aware of the changes made to record, so simply calling Attach() and then Save() should be enough!?!?) What am i missing? Development Environment: VS2010RC - Entity Framework 4 (no POCOs) Thanks in advance

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• Fluent NHibernate Self Referencing Many To Many

  - by Jeremy

  I have an entity called Books that can have a list of more books called RelatedBooks. The abbreviated Book entity looks something likes this: public class Book { public virtual long Id { get; private set; } public virtual IList<Book> RelatedBooks { get; set; } } Here is what the mapping looks like for this relationship HasManyToMany(x => x.RelatedBooks) .ParentKeyColumn("BookId") .ChildKeyColumn("RelatedBookId") .Table("RelatedBooks") .Cascade.SaveUpdate(); Here is a sample of the data that is then generated in the RelatedBooks table: BookId RelatedBookId 1 2 1 3 The problem happens when I Try to delete a book. If I delete the book that has an ID of 1, everything works ok and the RelatedBooks table has the two corresponding records removed. However if I try to delete the book with an ID of 3, I get the error "The DELETE statement conflicted with the REFERENCE constraint "FK5B54405174BAB605". The conflict occurred in database "Test", table "dbo.RelatedBooks", column 'RelatedBookId'". Basically what is happening is the Book cannot be deleted because the record in the RelatedBooks table that has a RelatedBookId of 3 is never deleted. How do I get that record to be deleted when I delete a book? EDIT After changing the Cascade from SaveUpdate() to All(), the same problem still exists if I try to delete the Book with an ID of 3. Also with Cascade set to All(), if delete the Book with and ID of 1, then all 3 books (ID's: 1, 2 and 3) are deleted so that won't work either. Looking at the SQL that is executed when the Book.Delete() method is called when I delete the Book with an ID of 3, it looks like the SELECT statement is looking at the wrong column (which I assume means that the SQL DELETE statment would make the same mistake, therefore never removing that record). Here is the SQL for the RelatedBook SELECT relatedboo0_.BookId as BookId3_ , relatedboo0_.RelatedBookId as RelatedB2_3_ , book1_.Id as Id14_0_ FROM RelatedBooks relatedboo0_ left outer join [Book] book1_ on relatedboo0_.RelatedBookId=book1_.Id WHERE relatedboo0_.BookId=3 The WHERE statment should look something like this for thie particular case: WHERE relatedboo0_.RelatedBookId = 3 SOLUTION Here is what I had to do to get it working for all cases Mapping: HasManyToMany(x => x.RelatedBooks) .ParentKeyColumn("BookId") .ChildKeyColumn("RelatedBookId") .Table("RelatedBooks"); Code: var book = currentSession.Get<Book>(bookId); if (book != null) { //Remove all of the Related Books book.RelatedBooks.Clear(); //Get all other books that have this book as a related book var booksWithRelated = currentSession.CreateCriteria<Book>() .CreateAlias("RelatedBooks", "br") .Add(Restrictions.Eq("br.Id", book.Id)) .List<Book>(); //Remove this book as a Related Book for all other Books foreach (var tempBook in booksWithRelated) { tempBook.RelatedBooks.Remove(book); tempBook.Save(); } //Delete the book book.Delete(); }

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• Linq guru - filtering related entities...

  - by vdh_ant

  My table structure is as follows: Person 1-M PesonAddress Person 1-M PesonPhone Person 1-M PesonEmail Person 1-M Contract Contract M-M Program Contract M-1 Organization At the end of this query I need a populated object graph where each person has their: PesonAddress's PesonPhone's PesonEmail's PesonPhone's Contract's - and this has its respective Program's Now I had the following query and I thought that it was working great, but it has a couple of problems: from people in ctx.People.Include("PersonAddress") .Include("PersonLandline") .Include("PersonMobile") .Include("PersonEmail") .Include("Contract") .Include("Contract.Program") where people.Contract.Any( contract => (param.OrganizationId == contract.OrganizationId) && contract.Program.Any( contractProgram => (param.ProgramId == contractProgram.ProgramId))) select people; The problem is that it filters the person to the criteria but not the Contracts or the Contract's Programs. It brings back all Contracts that each person has not just the ones that have an OrganizationId of x and the same goes for each of those Contract's Programs respectively. What I want is only the people that have at least one contract with an OrgId of x with and where that contract has a Program with the Id of y... and for the object graph that is returned to have only the contracts that match and programs within that contract that match. I kinda understand why its not working, but I don't know how to change it so it is working... This is my attempt thus far: from people in ctx.People.Include("PersonAddress") .Include("PersonLandline") .Include("PersonMobile") .Include("PersonEmail") .Include("Contract") .Include("Contract.Program") let currentContracts = from contract in people.Contract where (param.OrganizationId == contract.OrganizationId) select contract let currentContractPrograms = from contractProgram in currentContracts let temp = from x in contractProgram.Program where (param.ProgramId == contractProgram.ProgramId) select x where temp.Any() select temp where currentContracts.Any() && currentContractPrograms.Any() select new Person { PersonId = people.PersonId, FirstName = people.FirstName, ..., ...., MiddleName = people.MiddleName, Surname = people.Surname, ..., ...., Gender = people.Gender, DateOfBirth = people.DateOfBirth, ..., ...., Contract = currentContracts, ... }; //This doesn't work But this has several problems (where the Person type is an EF object): I am left to do the mapping by myself, which in this case there is quite a lot to map When ever I try to map a list to a property (i.e. Scholarship = currentScholarships) it says I can't because IEnumerable is trying to be cast to EntityCollection Include doesn't work Hence how do I get this to work. Keeping in mind that I am trying to do this as a compiled query so I think that means anonymous types are out.

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• Retrieving Encrypted Rich Text file and showing it in a RichTextBox C#

  - by Ranhiru

  OK, my need here is to save whatever typed in the rich text box to a file, encrypted, and also retrieve the text from the file again and show it back on the rich textbox. Here is my save code. private void cmdSave_Click(object sender, EventArgs e) { FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write); AesCryptoServiceProvider aes = new AesCryptoServiceProvider(); aes.GenerateIV(); aes.GenerateKey(); aes.Mode = CipherMode.CBC; TextWriter twKey = new StreamWriter("key"); twKey.Write(ASCIIEncoding.ASCII.GetString(aes.Key)); twKey.Close(); TextWriter twIV = new StreamWriter("IV"); twIV.Write(ASCIIEncoding.ASCII.GetString(aes.IV)); twIV.Close(); ICryptoTransform aesEncrypt = aes.CreateEncryptor(); CryptoStream cryptoStream = new CryptoStream(fs, aesEncrypt, CryptoStreamMode.Write); richTextBox1.SaveFile(cryptoStream, RichTextBoxStreamType.RichText); } I know the security consequences of saving the key and iv in a file but this just for testing :) Well, the saving part works fine which means no exceptions... The file is created in filePath and the key and IV files are created fine too... OK now for retrieving part where I am stuck :S private void cmdOpen_Click(object sender, EventArgs e) { OpenFileDialog openFile = new OpenFileDialog(); openFile.ShowDialog(); FileStream openRTF = new FileStream(openFile.FileName, FileMode.Open, FileAccess.Read); AesCryptoServiceProvider aes = new AesCryptoServiceProvider(); TextReader trKey = new StreamReader("key"); byte[] AesKey = ASCIIEncoding.ASCII.GetBytes(trKey.ReadLine()); TextReader trIV = new StreamReader("IV"); byte[] AesIV = ASCIIEncoding.ASCII.GetBytes(trIV.ReadLine()); aes.Key = AesKey; aes.IV = AesIV; ICryptoTransform aesDecrypt = aes.CreateDecryptor(); CryptoStream cryptoStream = new CryptoStream(openRTF, aesDecrypt, CryptoStreamMode.Read); StreamReader fx = new StreamReader(cryptoStream); richTextBox1.Rtf = fx.ReadToEnd(); //richTextBox1.LoadFile(fx.BaseStream, RichTextBoxStreamType.RichText); } But the richTextBox1.Rtf = fx.ReadToEnd(); throws an cryptographic exception "Padding is invalid and cannot be removed." while richTextBox1.LoadFile(fx.BaseStream, RichTextBoxStreamType.RichText); throws an NotSupportedException "Stream does not support seeking." Any suggestions on what i can do to load the data from the encrypted file and show it in the rich text box?

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• Calculate year for end date: PostgreSQL

  - by Dave Jarvis

  Background Users can pick dates as shown in the following screen shot: Any starting month/day and ending month/day combinations are valid, such as: Mar 22 to Jun 22 Dec 1 to Feb 28 The second combination is difficult (I call it the "tricky date scenario") because the year for the ending month/day is before the year for the starting month/day. That is to say, for the year 1900 (also shown selected in the screen shot above), the full dates would be: Dec 22, 1900 to Feb 28, 1901 Dec 22, 1901 to Feb 28, 1902 ... Dec 22, 2007 to Feb 28, 2008 Dec 22, 2008 to Feb 28, 2009 Problem Writing a SQL statement that selects values from a table with dates that fall between the start month/day and end month/day, regardless of how the start and end days are selected. In other words, this is a year wrapping problem. Inputs The query receives as parameters: Year1, Year2: The full range of years, independent of month/day combination. Month1, Day1: The starting day within the year to gather data. Month2, Day2: The ending day within the year (or the next year) to gather data. Previous Attempt Consider the following MySQL code (that worked): end_year = start_year + greatest( -1 * sign( datediff( date( concat_ws('-', year, end_month, end_day ) ), date( concat_ws('-', year, start_month, start_day ) ) ) ), 0 ) How it works, with respect to the tricky date scenario: Create two dates in the current year. The first date is Dec 22, 1900 and the second date is Feb 28, 1900. Count the difference, in days, between the two dates. If the result is negative, it means the year for the second date must be incremented by 1. In this case: Add 1 to the current year. Create a new end date: Feb 28, 1901. Check to see if the date range for the data falls between the start and calculated end date. If the result is positive, the dates have been provided in chronological order and nothing special needs to be done. This worked in MySQL because the difference in dates would be positive or negative. In PostgreSQL, the equivalent functionality always returns a positive number, regardless of their relative chronological order. Question How should the following (broken) code be rewritten for PostgreSQL to take into consideration the relative chronological order of the starting and ending month/day pairs (with respect to an annual temporal displacement)? SELECT m.amount FROM measurement m WHERE (extract(MONTH FROM m.taken) >= month1 AND extract(DAY FROM m.taken) >= day1) AND (extract(MONTH FROM m.taken) <= month2 AND extract(DAY FROM m.taken) <= day2) Any thoughts, comments, or questions? (The dates are pre-parsed into MM/DD format in PHP. My preference is for a pure PostgreSQL solution, but I am open to suggestions on what might make the problem simpler using PHP.) Versions PostgreSQL 8.4.4 and PHP 5.2.10

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• How to configure maximum number of transport channels in WCF using basicHttpBinding?

  - by Hemant

  Consider following code which is essentially a WCF host: [ServiceContract (Namespace = "http://www.mightycalc.com")] interface ICalculator { [OperationContract] int Add (int aNum1, int aNum2); } [ServiceBehavior (InstanceContextMode = InstanceContextMode.PerCall)] class Calculator: ICalculator { public int Add (int aNum1, int aNum2) { Thread.Sleep (2000); //Simulate a lengthy operation return aNum1 + aNum2; } } class Program { static void Main (string[] args) { try { using (var serviceHost = new ServiceHost (typeof (Calculator))) { var httpBinding = new BasicHttpBinding (BasicHttpSecurityMode.None); serviceHost.AddServiceEndpoint (typeof (ICalculator), httpBinding, "http://172.16.9.191:2221/calc"); serviceHost.Open (); Console.WriteLine ("Service is running. ENJOY!!!"); Console.WriteLine ("Type 'stop' and hit enter to stop the service."); Console.ReadLine (); if (serviceHost.State == CommunicationState.Opened) serviceHost.Close (); } } catch (Exception e) { Console.WriteLine (e); Console.ReadLine (); } } } Also the WCF client program is: class Program { static int COUNT = 0; static Timer timer = null; static void Main (string[] args) { var threads = new Thread[10]; for (int i = 0; i < threads.Length; i++) { threads[i] = new Thread (Calculate); threads[i].Start (null); } timer = new Timer (o => Console.WriteLine ("Count: {0}", COUNT), null, 1000, 1000); Console.ReadLine (); timer.Dispose (); } static void Calculate (object state) { var c = new CalculatorClient ("BasicHttpBinding_ICalculator"); c.Open (); while (true) { try { var sum = c.Add (2, 3); Interlocked.Increment (ref COUNT); } catch (Exception ex) { Console.WriteLine ("Error on thread {0}: {1}", Thread.CurrentThread.Name, ex.GetType ()); break; } } c.Close (); } } Basically, I am creating 10 proxy clients and then repeatedly calling Add service method. Now if I run both applications and observe opened TCP connections using netstat, I find that: If both client and server are running on same machine, number of tcp connections are equal to number of proxy objects. It means all requests are being served in parallel. Which is good. If I run server on a separate machine, I observed that maximum 2 TCP connections are opened regardless of the number of proxy objects I create. Only 2 requests run in parallel. It hurts the processing speed badly. If I switch to net.tcp binding, everything works fine (a separate TCP connection for each proxy object even if they are running on different machines). I am very confused and unable to make the basicHttpBinding use more TCP connections. I know it is a long question, but please help!

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• How to optimize Core Data query for full text search

  - by dk

  Can I optimize a Core Data query when searching for matching words in a text? (This question also pertains to the wisdom of custom SQL versus Core Data on an iPhone.) I'm working on a new (iPhone) app that is a handheld reference tool for a scientific database. The main interface is a standard searchable table view and I want as-you-type response as the user types new words. Words matches must be prefixes of words in the text. The text is composed of 100,000s of words. In my prototype I coded SQL directly. I created a separate "words" table containing every word in the text fields of the main entity. I indexed words and performed searches along the lines of SELECT id, * FROM textTable JOIN (SELECT DISTINCT textTableId FROM words WHERE word BETWEEN 'foo' AND 'fooz' ) ON id=textTableId LIMIT 50 This runs very fast. Using an IN would probably work just as well, i.e. SELECT * FROM textTable WHERE id IN (SELECT textTableId FROM words WHERE word BETWEEN 'foo' AND 'fooz' ) LIMIT 50 The LIMIT is crucial and allows me to display results quickly. I notify the user that there are too many to display if the limit is reached. This is kludgy. I've spent the last several days pondering the advantages of moving to Core Data, but I worry about the lack of control in the schema, indexing, and querying for an important query. Theoretically an NSPredicate of textField MATCHES '.*\bfoo.*' would just work, but I'm sure it will be slow. This sort of text search seems so common that I wonder what is the usual attack? Would you create a words entity as I did above and use a predicate of "word BEGINSWITH 'foo'"? Will that work as fast as my prototype? Will Core Data automatically create the right indexes? I can't find any explicit means of advising the persistent store about indexes. I see some nice advantages of Core Data in my iPhone app. The faulting and other memory considerations allow for efficient database retrievals for tableview queries without setting arbitrary limits. The object graph management allows me to easily traverse entities without writing lots of SQL. Migration features will be nice in the future. On the other hand, in a limited resource environment (iPhone) I worry that an automatically generated database will be bloated with metadata, unnecessary inverse relationships, inefficient attribute datatypes, etc. Should I dive in or proceed with caution?

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• CreateProcessAsUser error 1314

  - by kampi

  Hi! I want create a process under another user. So I use LogonUser and CreateProcessAsUser. But my problem is, that CreatePtocessAsUser always returns the errorcode 1314, which means "A required privilige is not held by the client". So my question is, what I am doing wrong? Or how can i give the priviliges to the handle? (I think the handle should have the privileges, or I am wrong?) Sorry for my english mistakes, but my english knowledge isn't the best :) Plesase help if anyone knows how to correct my application. This a part of my code. STARTUPINFO StartInfo; PROCESS_INFORMATION ProcInfo; TOKEN_PRIVILEGES tp; memset(&ProcInfo, 0, sizeof(ProcInfo)); memset(&StartInfo, 0 , sizeof(StartInfo)); StartInfo.cb = sizeof(StartInfo); HANDLE handle = NULL; if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ALL_ACCESS, &handle)) printf("\nOpenProcessError"); if (!LookupPrivilegeValue(NULL,SE_TCB_NAME, //SE_TCB_NAME, &tp.Privileges[0].Luid)) { printf("\nLookupPriv error"); } tp.PrivilegeCount = 1; tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;//SE_PRIVILEGE_ENABLED; if (!AdjustTokenPrivileges(handle, FALSE, &tp, 0, NULL, 0)) { printf("\nAdjustToken error"); } i = LogonUser(user, domain, password, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, &handle); printf("\nLogonUser return : %d",i); i = GetLastError(); printf("\nLogonUser getlast : %d",i); if (! ImpersonateLoggedOnUser(handle) ) printf("\nImpLoggedOnUser!"); i = CreateProcessAsUser(handle, "c:\\windows\\system32\\notepad.exe",NULL, NULL, NULL, true, CREATE_UNICODE_ENVIRONMENT |NORMAL_PRIORITY_CLASS | CREATE_NEW_CONSOLE, NULL, NULL, &StartInfo, &ProcInfo); printf("\nCreateProcessAsUser return : %d",i); i = GetLastError(); printf("\nCreateProcessAsUser getlast : %d",i); CloseHandle(handle); CloseHandle(ProcInfo.hProcess); CloseHandle(ProcInfo.hThread); Thanks in advance!

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• Loading a ConfigurationSection with a required child ConfigurationElement with .Net configuration fr

  - by Vadim Rybak

  I have a console application that is trying to load a CustomConfigurationSection from a web.config file. The custom configuration section has a custom configuration element that is required. This means that when I load the config section, I expect to see an exception if that config element is not present in the config. The problem is that the .NET framework seems to be completely ignoring the isRequired attribute. So when I load the config section, I just creates an instance of the custom configuration element and sets it on the config section. My question is, why is this happening? I want the GetSection() method to fire a ConfigurationErrors exception since a required element is missing from the configuration. Here is how my config section looks. public class MyConfigSection : ConfigurationSection { [ConfigurationProperty("MyConfigElement", IsRequired = true)] public MyConfigElement MyElement { get { return (MyConfigElement) this["MyConfigElement"]; } } } public class MyConfigElement : ConfigurationElement { [ConfigurationProperty("MyAttribute", IsRequired = true)] public string MyAttribute { get { return this["MyAttribute"].ToString(); } } } Here is how I load the config section. class Program { public static Configuration OpenConfigFile(string configPath) { var configFile = new FileInfo(configPath); var vdm = new VirtualDirectoryMapping(configFile.DirectoryName, true, configFile.Name); var wcfm = new WebConfigurationFileMap(); wcfm.VirtualDirectories.Add("/", vdm); return WebConfigurationManager.OpenMappedWebConfiguration(wcfm, "/"); } static void Main(string[] args) { try{ string path = @"C:\Users\vrybak\Desktop\Web.config"; var configManager = OpenConfigFile(path); var configSection = configManager.GetSection("MyConfigSection") as MyConfigSection; MyConfigElement elem = configSection.MyElement; } catch (ConfigurationErrorsException ex){ Console.WriteLine(ex.ToString()); } } Here is what my config file looks like. <?xml version="1.0"?> <configuration> <configSections> <section name="MyConfigSection" type="configurationFrameworkTestHarness.MyConfigSection, configurationFrameworkTestHarness" /> </configSections> <MyConfigSection> </MyConfigSection> The wierd part is that if I open the config file and load the section 2 times in a row, I will get the exception that I expect. var configManager = OpenConfigFile(path); var configSection = configManager.GetSection("MyConfigSection") as MyConfigSection; configManager = OpenConfigFile(path); configSection = configManager.GetSection("MyConfigSection") as MyConfigSection; If I use the code above, then the exception will fire and tell me that MyConfigElement is required. The question is Why is it not throwing this exception the first time??

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• Git for Websites / post-receive / Separation of Test and Production Sites

  - by Walt W

  Hi all, I'm using Git to manage my website's source code and deployment, and currently have the test and live sites running on the same box. Following this resource http://toroid.org/ams/git-website-howto originally, I came up with the following post-receive hook script to differentiate between pushes to my live site and pushes to my test site: while read ref do #echo "Ref updated:" #echo $ref -- would print something like example at top of file result=`echo $ref | gawk -F' ' '{ print $3 }'` if [ $result != "" ]; then echo "Branch found: " echo $result case $result in refs/heads/master ) git --work-tree=c:/temp/BLAH checkout -f master echo "Updated master" ;; refs/heads/testbranch ) git --work-tree=c:/temp/BLAH2 checkout -f testbranch echo "Updated testbranch" ;; * ) echo "No update known for $result" ;; esac fi done echo "Post-receive updates complete" However, I have doubts that this is actually safe :) I'm by no means a Git expert, but I am guessing that Git probably keeps track of the current checked-out branch head, and this approach probably has the potential to confuse it to no end. So a few questions: IS this safe? Would a better approach be to have my base repository be the test site repository (with corresponding working directory), and then have that repository push changes to a new live site repository, which has a corresponding working directory to the live site base? This would also allow me to move the production to a different server and keep the deployment chain intact. Is there something I'm missing? Is there a different, clean way to differentiate between test and production deployments when using Git for managing websites? As an additional note in light of Vi's answer, is there a good way to do this that would handle deletions without mucking with the file system much? Thank you, -Walt PS - The script I came up with for the multiple repos (and am using unless I hear better) is as follows: sitename=`basename \`pwd\`` while read ref do #echo "Ref updated:" #echo $ref -- would print something like example at top of file result=`echo $ref | gawk -F' ' '{ print $3 }'` if [ $result != "" ]; then echo "Branch found: " echo $result case $result in refs/heads/master ) git checkout -q -f master if [ $? -eq 0 ]; then echo "Test Site checked out properly" else echo "Failed to checkout test site!" fi ;; refs/heads/live-site ) git push -q ../Live/$sitename live-site:master if [ $? -eq 0 ]; then echo "Live Site received updates properly" else echo "Failed to push updates to Live Site" fi ;; * ) echo "No update known for $result" ;; esac fi done echo "Post-receive updates complete" And then the repo in ../Live/$sitename (these are "bare" repos with working trees added after init) has the basic post-receive: git checkout -f if [ $? -eq 0 ]; then echo "Live site `basename \`pwd\`` checked out successfully" else echo "Live site failed to checkout" fi

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• Data denormalization and C# objects DB serialization

  - by Robert Koritnik

  I'm using a DB table with various different entities. This means that I can't have an arbitrary number of fields in it to save all kinds of different entities. I want instead save just the most important fields (dates, reference IDs - kind of foreign key to various other tables, most important text fields etc.) and an additional text field where I'd like to store more complete object data. the most obvious solution would be to use XML strings and store those. The second most obvious choice would be JSON, that usually shorter and probably also faster to serialize/deserialize... And is probably also faster. But is it really? My objects also wouldn't need to be strictly serializable, because JsonSerializer is usually able to serialize anything. Even anonymous objects, that may as well be used here. What would be the most optimal solution to solve this problem? Additional info My DB is highly normalised and I'm using Entity Framework, but for the purpose of having external super-fast fulltext search functionality I'm sacrificing a bit DB denormalisation. Just for the info I'm using SphinxSE on top of MySql. Sphinx would return row IDs that I would use to fast query my index optimised conglomerate table to get most important data from it much much faster than querying multiple tables all over my DB. My table would have columns like: RowID (auto increment) EntityID (of the actual entity - but not directly related because this would have to point to different tables) EntityType (so I would be able to get the actual entity if needed) DateAdded (record timestamp when it's been added into this table) Title Metadata (serialized data related to particular entity type) This table would be indexed with SPHINX indexer. When I would search for data using this indexer I would provide a series of EntityIDs and a limit date. Indexer would have to return a very limited paged amount of RowIDs ordered by DateAdded (descending). I would then just join these RowIDs to my table and get relevant results. So this won't actually be full text search but a filtering search. Getting RowIDs would be very fast this way and getting results back from the table would be much faster than comparing EntityIDs and DateAdded comparisons even though they would be properly indexed.

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• Insert default value if input-text is deleted

  - by Kim Andersen

  Hi all I have the following piece of jQuery code: $(".SearchForm input:text").each(function(){ /* Sets the current value as the defaultvalue attribute */ if(allowedDefaults.indexOf($(this).val()) > 0 || $(this).val() == "") { $(this).attr("defaultvalue", $(this).val()); $(this).css("color","#9d9d9d"); /* Onfocus, if default value clear the field */ $(this).focus(function(){ if($(this).val() == $(this).attr("defaultvalue")) { $(this).val(""); $(this).css("color","#4c4c4c"); } }); /* Onblur, if empty, insert defaultvalue */ $(this).blur(function(){ alert("ud"); if($(this).val() == "") { $(this).val($(this).attr("defaultvalue")); $(this).css("color","#9d9d9d"); }else { $(this).removeClass("ignore"); } }); } }); I use this code to insert some default text into some of my input fields, when nothing else is typed in. This means that when a user sees my search-form, the defaultvalues will be set as an attribute on the input-field, and this will be the value that is shown. When a user clicks inside of the input field, the default value will be removed. When the user sees an input field at first is looks like this: <input type="text" value="" defaultvalue="From" /> This works just fine, but I have a big challenge. If a user have posted the form, and something is entered into one of the fields, then I can't show the default value in the field, if the user deletes the text from the input field. This is happening because the value of the text-field is still containing something, even when the user deletes the content. So my problem is how to show the default value when the form is submitted, and the user then removes the typed in content? When the form is submitted the input looks like this, and keeps looking like this until the form is submitted again: <input type="text" value="someValue" defaultvalue="From" /> So I need to show the default value in the input-field right after the user have deleted the content in the field, and removed the focus from the field. Does everyone understand what my problem is? Otherwise just ask, I have struggled with this one for quite some times now, so any help will be greatly appreciated. Thanks in advance, Kim Andersen

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• How to use multiple flatpages models in a django app?

  - by the_drow

  I have multiple models that can be converted to flatpages but have to have some extra information (For example I have an about us page but I also have a blog). However I understand that there must be only one flatpages model since the middleware only returns the flatpages instance and does not resolve the child models. What do I have to do? EDIT: It seems I need to change the views. Here's the current code: from django.contrib.flatpages.models import FlatPage from django.template import loader, RequestContext from django.shortcuts import get_object_or_404 from django.http import HttpResponse, HttpResponseRedirect from django.conf import settings from django.core.xheaders import populate_xheaders from django.utils.safestring import mark_safe from django.views.decorators.csrf import csrf_protect DEFAULT_TEMPLATE = 'flatpages/default.html' # This view is called from FlatpageFallbackMiddleware.process_response # when a 404 is raised, which often means CsrfViewMiddleware.process_view # has not been called even if CsrfViewMiddleware is installed. So we need # to use @csrf_protect, in case the template needs {% csrf_token %}. # However, we can't just wrap this view; if no matching flatpage exists, # or a redirect is required for authentication, the 404 needs to be returned # without any CSRF checks. Therefore, we only # CSRF protect the internal implementation. def flatpage(request, url): """ Public interface to the flat page view. Models: `flatpages.flatpages` Templates: Uses the template defined by the ``template_name`` field, or `flatpages/default.html` if template_name is not defined. Context: flatpage `flatpages.flatpages` object """ if not url.endswith('/') and settings.APPEND_SLASH: return HttpResponseRedirect("%s/" % request.path) if not url.startswith('/'): url = "/" + url # Here instead of getting the flat page it needs to find if it has a page with a child model. f = get_object_or_404(FlatPage, url__exact=url, sites__id__exact=settings.SITE_ID) return render_flatpage(request, f) @csrf_protect def render_flatpage(request, f): """ Internal interface to the flat page view. """ # If registration is required for accessing this page, and the user isn't # logged in, redirect to the login page. if f.registration_required and not request.user.is_authenticated(): from django.contrib.auth.views import redirect_to_login return redirect_to_login(request.path) if f.template_name: t = loader.select_template((f.template_name, DEFAULT_TEMPLATE)) else: t = loader.get_template(DEFAULT_TEMPLATE) # To avoid having to always use the "|safe" filter in flatpage templates, # mark the title and content as already safe (since they are raw HTML # content in the first place). f.title = mark_safe(f.title) f.content = mark_safe(f.content) # Here I need to be able to configure what I am passing in the context c = RequestContext(request, { 'flatpage': f, }) response = HttpResponse(t.render(c)) populate_xheaders(request, response, FlatPage, f.id) return response

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• Challenge: Neater way of currying or partially applying C#4's string.Join

  - by Damian Powell

  Background I recently read that .NET 4's System.String class has a new overload of the Join method. This new overload takes a separator, and an IEnumerable<T> which allows arbitrary collections to be joined into a single string without the need to convert to an intermediate string array. Cool! That means I can now do this: var evenNums = Enumerable.Range(1, 100) .Where(i => i%2 == 0); var list = string.Join(",",evenNums); ...instead of this: var evenNums = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .Select(i => i.ToString()) .ToArray(); var list = string.Join(",", evenNums); ...thus saving on a conversion of every item to a string, and then the allocation of an array. The Problem However, being a fan of the functional style of programming in general, and method chaining in C# in particular, I would prefer to be able to write something like this: var list = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .string.Join(","); This is not legal C# though. The closest I've managed to get is this: var list = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .ApplyTo( Functional.Curry<string, IEnumerable<object>, string> (string.Join)(",") ); ...using the following extension methods: public static class Functional { public static TRslt ApplyTo<TArg, TRslt>(this TArg arg, Func<TArg, TRslt> func) { return func(arg); } public static Func<T1, Func<T2, TResult>> Curry<T1, T2, TResult>(this Func<T1, T2, TResult> func) { Func<Func<T1, T2, TResult>, Func<T1, Func<T2, TResult>>> curried = f => x => y => f(x, y); return curried(func); } } This is quite verbose, requires explicit definition of the parameters and return type of the string.Join overload I want to use, and relies upon C#4's variance features because we are defining one of the arguments as IEnumerable rather than IEnumerable. The Challenge Can you find a neater way of achieving this using the method-chaining style of programming?

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