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• When would I need to call base() in C#?

  - by user310291

  My BaseClass Constructor is called whereas I have a constructor in derived class so when would I need to call base() ? class BaseClass { public BaseClass() { Debug.Print("BaseClass"); } } class InheritedClass : BaseClass { public InheritedClass() { Debug.Print("InheritedClass"); } } private void Form1_Load(object sender, EventArgs e) { InheritedClass inheritedClass = new InheritedClass(); } Output 'Inheritance.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\Accessibility\v4.0_4.0.0.0__b03f5f7f11d50a3a\Accessibility.dll' 'Inheritance.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. BaseClass InheritedClass The thread 'vshost.RunParkingWindow' (0x12b4) has exited with code 0 (0x0). The thread '<No Name>' (0x85c) has exited with code 0 (0x0). The program '[4368] Inheritance.vshost.exe: Program Trace' has exited with code 0 (0x0). The program '[4368] Inheritance.vshost.exe: Managed (v4.0.30319)' has exited with code 0 (0x0).

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• How do I inherit abstract unit tests in Ruby?

  - by Graeme Moss

  I have two unit tests that should share a lot of common tests with slightly different setup methods. If I write something like class Abstract < Test::Unit::TestCase def setup @field = create end def test_1 ... end end class Concrete1 < Abstract def create SomeClass1.new end end class Concrete2 < Abstract def create SomeClass2.new end end then Concrete1 does not seem to inherit the tests from Abstract. Or at least I cannot get them to run in eclipse. If I choose "Run all TestCases" for the file that contains Concrete1 then Abstract is run even though I do not want it to be. If I specify Concrete1 then it does not run any tests at all! If I specify test_1 in Concrete1 then it complains it cannot find it ("uncaught throw :invalid_test (ArgumentError)"). I'm new to Ruby. What am I missing here?

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• Declaring two classes that contain instance variables of each others' types.

  - by Benji XVI

  Let’s say you wish to have two classes like so, each declaring an instance variable that is of the other’s class. @interface A : NSObject { B *something; } @end @interface B : NSObject { A *something; } @end It seems to be impossible to declare these classes with these instance variables. In order for A to include an IV of class B, B must already be compiled, and so its @interface must come before A’s. But A’s must be put before B’s for the same reason. Putting the two class declarations in separate files, and #import-ing each other’s .h doesn’t work either, for obvious reasons. So, what is the solution? Or is this either (1) impossible or (2) indicative of a bad design anyway?

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• how to use ip address in xsl

  - by user1597122

  I'm using xsl to generate html from xsl. I have to use ip address in name of the class in css like this: <td><div title="delete" > <xsl:attribute name="class"> delete_link_<xsl:value-of select="destinationIp"/> </xsl:attribute> <img class="row-remover" src="/media/img/remove.png"/> </div></td> and i have this jquery function: $('.delete_link_<xsl:value-of select="destinationIp"/>').click( function() { // do some thing here }); but because there are 'dots' in ip address, the above code doesn't work. when i remove dots of destinationIp tag in xml file, it works. so i think it has problem with 'dot'. any idea to make it work? really thanks :)

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• nested has_many

  - by Nick Vanderbilt

  I am using Rails 2.3.5. Class User < ActiveRecord::Base has_many :phones end class Phone < ActiveRecord::Base has_many :frequency_bands end I want to get all the frequency_bands for a user. I know I can write a method def freq_bands for User but I would like to know if it is possible to have has_many freq_bands for a User. In this way I can chain the call. What I would like to have is class User < ActiveRecor::Base has_many :frequence_bands, :through => phones end I think it is possible to have nested has_many using this plugin http://github.com/ianwhite/nested_has_many_through However if possible I would like to avoid using another plugin and rely solely on rails.

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• how to create 2 controllers with same actionresult 2 views but one implementation

  - by amalatsliit

  I got a controller in my mvc application like below. public class BaseController: Controller { protected void LogInfo() { logger.InfoFormat("[SessionID: {0}, RemoteIP: {1}]", Session.SessionID, Request.UserHostAddress); } } public class FirstController : BaseController { public ActionResult Index(string name) { LogInfo(); getQueryString(); if(IsValidRec()) { if(Errors())) { return View("Error"); } var viewname = getViewName(name); return view(viewname); } else return view("NotFound"); } } I need to create another controller(SecondController ) with same ActionResult method that FirstController has but without any implementation. Because I dont wont to repeat same code in 2 ActionResult methods. what is the best way to do that. I tried in following way but I m getting error when I initialize my protected method 'LogInfo()' public class SecondController : BaseController { public ActionResult Index(string name) { var firstcontroller = new FirstController(); return firstcontroller.Index(name); } }

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• Localized database strings

  - by Steve

  I have a small Grails application that has the following domain: class Meal { String name String description String allergyNote } For localization purposes the three strings should now be available in multiple languages. For example, while an English user would see name="Steak", a Spanish user should see name="Filete" in the output. I was thinking of doing the following: class Language { String isoCode String languageName } class TranslatedString { Language language String translation } but I am not sure how to link the Meals with the TranslatedStrings as it is used for three members, also I would like to use it for other classes (not just Meal) as well (or do I need to have separated tables, i.e. a MealNameTranslated, MealDescriptionTranslated, etc tables?). I know this is probably a stupid question, but I am a beginner and have not been able to figure this out :-(

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• django: how to use many-to-many relationships in values()?

  - by john

  i need to group results by a field that requires a few joins from the original model: // response_filter_args is created dynamically responses = Response.objects.filter(**response_filter_args) \ .values('customer__tags__tag') \ # django doesn't like this .annotate(average_score=Avg('rating__score')) Response - customer - tags (many-to-many field pointing to Tag) - tag (the tag as a string) Models are: class Response(models.Model): customer = models.ForeignKey(Customer) ... class Customer(models.Model): tags = models.ManyToManyField(Tag) ... class Tag(models.Model): tag = models.CharField(max_length=255) ... i'm trying to calculate average ratings. to make it work i need to tell django to group by 'tag', but it refuses to. it gives an error: Invalid field name: 'customer__tags__tag' anyone know how i can get it to group by tag? i've tried all the combinations of underscores in customer_tags_tag that i can think of, but nothing works.

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• Good Design for Initialization of Static Array

  - by jplot

  I have a question regarding good design in C++. I have a class A, and all objects of this class use an integer array of constant values (they should share the same array, as their values are constant). The array needs to be computed (just once) before any object A. I thought about having another class B which contains the integer array as a static member, an init() method which would fill this array according to some formula and a static boolean flag initialized (if this variable if true then the init() method would do nothing), but I'm not sure this is the best way to solve my design issue. So my question is, what would be a good design/way to accomplish this ? Thanks in advance.

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• Java's PipedReader / PipedWriter equivalents in C#?

  - by devoured elysium

  I have defined a Pipe class in Java, making use of PipedReader and PipedWriter. I am now trying to port this same class to C#. Is it possible to accomplish the same as shown in the following code in C#? public final class Pipe { private final PipedReader pipedReader = new PipedReader(); private final PipedWriter pipedWriter = new PipedWriter(); public Pipe() { pipedWriter.connect(pipedReader); } ... } I am guessing what I'll want to use in C# for PipedReader and PipedWriter will be StreamReader and StreamWriter? Is there something like a connect() method? Thanks

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• C#: Converting string to namespace

  - by Am

  Hi, I have an interface named IHarvester. There are 3 implementations of that interface, each under their own namespace: Google Yahoo Bing A HarvesterManager uses the given harvester. It knows the interface and all 3 implementations. I want some way of letting the class user say in which harvester it wants to use. And in the code select that implementation, without a switch-case implementation. Can reflection save my day? Here is the code bits: // repeat for each harvester namespace Harvester.Google { public abstract class Fetcher : BaseHarvester, IInfoHarvester {...} } public enum HarvestingSource { Google, Yahoo, Bing, } class HarvesterManager { public HarvestingSource PreferedSource {get;set;} public HarvestSomthing() { switch (PreferedSource) .... // awful... } } Thanks.

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• Serialize object from within

  - by Maximus

  I have the class testClass which has the method save. This method saves object to a database. But it needs to serialize object before saving. How can I serialize object from within the class to do that? class testClass { private $prop = 777; public function save() { $serializedObject = serialize(self); DB::insert('objects', array('id', 'object')) ->values(array(1, $serializedObject)) ->execute(); } } serialize(self) obviously doesn't work.

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• jQuery get attribute

  - by Happy

  There are many class="item" blocks on the page. For each one there is different var item_link and ajax request. Ajax searches for src attribute of .message img and throws it to var src. $(".item").each(function(){ var item_link = "http://..."; $(this).prepend('<div class="src"></div>'); $.get(item_link, function(data) { var src = $('.message img', data).attr('src'); }); }); How to print var src to <div class="src"></div>? Thanks.

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• Get length of a Dictionary

  - by StealthRT

  Hey all i am new at this Dictionary class in VB.net. I am wanting to reteive how many items in the Dictionary array there are: But doing this: Dim showNumber As Integer = tmpShows.Length Does not seem to yield 4 as it should? The code for the Dictionary i have is this: Dim all = New Dictionary(Of String, Object)() Dim info = New Dictionary(Of String, Object)() info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(3).ChildNodes(2).InnerText info!Shows = From tag In .SelectNodes(".//a[@class='thickbox']") Select New With {.Show = tag.Attributes("title").Value, .Link = tag.Attributes("href").Value} Dim tmpShows = all.Item(info!Station) Dim showNumber As Integer = tmpShows.Length What am i missing in order to get the 4 length i am looking for?

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• When should methods be made private?

  - by AaronSzy

  There are lots of times where i'm not sure whether a particular method should be made private or not. For example, i'm building a class right now, which, is responsible for generating a report. This class has a buildReport method and several methods which collect the necessary data for buildReport. // single public method // uses a set of helper methods public buildReport() // helper methods private avgSurveyTime() private fetchVendors() private fetchSendCounts() private ... Im debating whether i should make these helper methods public. The only method i really plan on calling outside at the moment is buildReport. However, it might be useful to get just a list of the vendors with fetchVendors etc. I see two schools of thought on this: You can always expose as little as possible. (In which case, many of my classes would only have one public method) OR you can expose all you can that might be useful to the user of the class. Is there a good rule of thumb to use for deciding when methods should be made public/private?

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• Android Timer update UI between multiple tasks

  - by Rilcon42

  I have tried multiple ways to have a single persistent timer update the ui in multiple activities, and nothing seems to work. I have tried an AsyncTask, a Handler, and a CountDownTimer. The code below does not execute the first Log.i statement.... Is there a better way to start the timer (which must be called from another class) in Main (which is the only persistent class)? public static void MainLawTimer() { MainActivity.lawTimer = new CountDownTimer(MainActivity.timeLeft, 1000) { public void onTick(long millisUntilFinished) { Log.i("aaa","Timer running. Time left: "+MainActivity.timeLeft); MainActivity.timeLeft--; if(MainActivity.timeLeft<=0) { //do stuff } else { //call method in another class } }

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• Rails Scope for association of 0 size.

  - by MissingHandle

  I'm having trouble figuring out the scope method for all the Foos that have no Bars. That is: class Foo < ActiveRecord::Base has_may :bars end class Bar < ActiveRecord::Base belongs_to :foo end I'd like to write a scope method that returns me all the foos that have no bars. Something like: class Foo < ActiveRecord::Base has_may :bars scope :has_no_bars, includes(:bars).where("COUNT(foo.bars) = 0") end But I don't understand the appropriate syntax. Any help? Happy to use a MetaWhere solution if easier.

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• Help in restructuring a project

  - by mrblah

  I have a commerce application, asp.net mvc. I want it to be extensible in the sense others can create other payment providers, as long as they adhere to the interfaces. /blah.core /blah.web /blah.Authorize.net (Implementation of a payment provider using interfaces Ipaymentconfig and paymentdata class) Now the problem is this: /blah.core - PaymentData /blah.core.interfaces - IPaymentConfig where Payment Data looks like: using blah.core; public class PaymentData { public Order Order {get;set;} } IPayment data contains classes from blah.core like the Order class. Now I want to use the actual Authorize.net implementation, so when I tried to reference it in the blah.core project I got a circular dependency error. How could I solve this problem? Many have said to break out the interfaces into their own project, but the problem is PaymentData references entities that are found in blah.core also, so there doesn't seem to be a way around this (in my head anyhow). How can I redesign this?

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• Hibernate and mssql inner join rowcount

  - by ez2sarang

  I am struggling with Hibernate Criteria. My aim is to create the following request using Hibernate Criteria : select count(*) as y0_ from PInterface this_ inner join Product product2_ on this_.product_id=product2_.id where this_.product_interface_type_id=? Here is my code: @Entity @Table(name = "PInterface") public class PInterface { @Id @GeneratedValue @Column(name = "id", nullable = false, insertable = false, updatable = false) private int id; @Column(name = "product_id") private int productId; @Column(name = "product_interface_type_id") private int type; @ManyToOne(optional=false) @JoinColumn(name = "product_id", referencedColumnName = "id", insertable=false, updatable=false) private Product product; } @Entity @Table(name = "Product") public class Product { @Id @GeneratedValue @Column(name = "id", nullable = false, insertable = false, updatable = false) private int id; private String name; } //Criteria is : Object criteria = sessionFactory.getCurrentSession() .createCriteria(PInterface.class) .add(Restrictions.eq("type", 1)) .setProjection(Projections.rowCount()) .uniqueResult() ; However, the results ... select count(*) as y0_ from PInterface this_ where this_.product_interface_type_id=? Where Inner join? Thank you for help!

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• Rails 2.3: using another models named_scope inside another named_scope

  - by mustafi

  Hi Let's say I have two models like so: class Comment < ActiveRecord::Base belongs_to :user named_scope :about_x :conditions => "comments.text like '%x%')" end class User < ActiveRecord::Base has_many :comments end How can I add a named_scope to the user model like so class User < ActiveRecord::Base has_many :comments named_scope :comments_about_x, :includes => :comments, :comments_named_scope => :about_x end Which allows me to do all_user_comments_about_x = User.comments_about_x The reasoning is I often need to use the comment models about_x named scope logic but I don't want to have "comments.text like '%x%')" scattered around my code. I hope this make sense :) Thank you

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• Rails valiation among a three model relationship

  - by Andrew

  I'm working on a three model relationship with one aspect that I'm not sure how to approach. Here's the basic relationship: class Taxonomy has_many :terms # attribute: `inclusive`, default => false end class Term belongs_to :taxonomy has_and_belongs_to_many :photos end class Photo has_and_belongs_to_many :terms end This is pretty straightforward stuff except for one thing: A Taxonomy can be either 'Inclusive' or 'Exclusive'. Exclusive means the terms are mutually exclusive, Inclusive means they're not. So, if a Taxonomy is exclusive ie. taxonomy.inclusive = false, then there can only be one term from that taxonomy attached to a given photo. Now, I can handle this on the client-side without a problem, but I am not quite sure how to set up a validation on Photos (or somewhere else) that says basically: "validate that no more than one term from an exclusive taxonomy is associated with this record." Any ideas on how to do that?

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• Is it possible to use variables and data in in-template css properties?

  - by aruman89

  <td style="width:77px" id="<%=id%>"><div class="condbar"><div class="condprogress" style="width:Data.condition%; background:condColor"></div> <div class="condvalue"><%=condition%><span>%</span></div></div></td> I want to set the width of a div .roster_condprogress as a percentage according to data and change the color accordingly (using a variable for that). What is a correct way to write this? (if it exists)

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• Not quite nested inlines?

  - by Lynden Shields

  Not quite sure what to call this, it's not quite nested inlines, but is probably related. I have a 3 level hierarchy of objects, A one-to-many B one-to-many C. Therefore, every C implicitly also belongs to an A. class A(models.Model): stuff = models.CharField("Stuff", max_length=50) class B(models.Model): a = models.ForeignKey(A) class C(models.Model): b = models.ForeignKey(B) I would like all C's that belong to an A to be listed on the admin page for A in an in-line. They do not have to show which B they belong to on the same page. Is this possible or is it the same problem as nested inlines anyway? If it's possible, how do I do it? I'm using django 1.3

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• Is it possible in Java to implement something similar to Object.clone() ?

  - by devoured elysium

  The Object.clone() method in Java is pretty special, as instead of returning a copy of the object that is to be cloned with the Object type, it returns the correct Object type. This can be better described with the following code: class A extends Object { public A clone() { return super.clone(); //although Object.clone() is from the Object class //this super.clone() will return an A object! } } class B extends A { } public static void main(String[] args) { B = new B(); B.clone();//here, although we haven't defined a clone() method, the cloned //object return is of type B! } So, could anyone explain if possible if is there anyway to replicate what happens inside Object.clone()'s method?

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• ajax request internal server error

  - by joe

  Everything is working good on local but when i try same codes in production, i get 500 (Internal Server Error) error. entries.controller def set_spam @entry = Entry.find(params[:entry_id]) @entry.spam = params[:what] == "spam" ? true : false @entry.save respond_to do |format| format.js end end application.js $(".entry-actions .spams img").click(function () { $.post("/set-spam", { entry_id: $(this).attr("entry_id"), what: $(this).attr("class") } ); return false; }); view <div class="spams"> <img title="spam" class="spam" src="/images/pixel.gif" entry_id="<%= entry.id %>" /> </div> route post "/set-spam" => "entries#set_spam"

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