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• What exactly is REST architecture and how is it implemented in Rails?

  - by Jagira

  This is what I think of REST architecture. For every resource, there is an unique URI. We can manipulate that object using its URI and HTTP actions [POST, GET, PUT and DELETE]. The HTTP request transfers the representation of the state of that object. In all the texts I have read, REST is explained in a weird and confusing manner. One more thing, RESTFUL implementation in rails produces different urls for different purposes. Like /teams - for 'index' method... /teams/new - for 'new' method and so on. Ain't this moving away from rest, which defines that each resource has one unique URI???

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• Which design pattern should I be using?

  - by Gabriel

  Here's briefly what I'm trying to do. The user supplies me with a link to a photo from one of several photo-sharing websites (such as Flickr, Zooomr, et. al). I then do some processing on the photo using their respective APIs. Right now, I'm only implementing one service, but I will most likely add more in the near future. I don't want to have a bunch of if/else or switch statements to define the logic for the different websites (but maybe that's necessary?) I'd rather just call GetImage(url) and have it get me the image from whatever service the url's domain is from. I'm confused how the GetImage function and classes should be designed. Maybe I need the strategy pattern? I'm still reading and trying to understand the various design patterns and how I could make one fit in this case. I'm doing this in C#, but this question is language-agnostic.

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• Using C++, how to call a base class method from a derived class method and apply this to an object passed as an argument?

  - by Chris

  I can't figure out how to call a base class method from a derived class method but concurrently applying this method call at an object passed as argument. What I mean is this: class Animal { virtual void eat(Animal& to_be_eaten) = 0; }; class Carnivores: public Animal { virtual void eat(Animal& to_be_eaten) { /*implementation here*/} }; class Wolf : public Carnivores { virtual void eat(Animal& to_be_eaten) { /*call eat method(of Base class) of Base to_be_eaten here*/ } } I thought of something like this dynamic_cast<Carnivores&>(to_be_eaten).eat(*this) //and got a segmentation fault Is there any way for this to be done? Thank you! New edit:: Updated the code

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• Storing i18n data in a database using XML

  - by TigrouMeow

  Hello, I may have to store some i18n-ed data in my database using XML if I don't fight back. That's not my choice, but it's in the specifications I have to follow. We would have, by example, something like following in a 'Country' column: <lang='fr'>Etats-Unis</lang> <lang='en'>United States</lang> This would apply to many columns in the database. I don't think it's a good idea at all. I tend to think that a cell in a database should represent a single piece of data (better for look-up), and that the database should have two dimensions maximum and not 3 or more (one request more would be required per dimension / a dimension here would be equal to the number of XML attributes). My idea was to have a separate table for all the translations, with columns such as : ID / Language / Translation. However, I should admit that I'm really not sure what is the best way to store data in various languages in a DB... Thanks for your advices :)

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• How can I detect whether an image is a PNG or APNG format?

  - by perlit

  APNG is backwards compatible with PNG. I opened up an apng and png file in a hex editor and the first few bytes look identical. So if a user uploads either of these formats, how do I detect what the format really is? I've seen this done on some sites that block apng. I'm guessing the ImageMagick library makes this easy, but what if I were to do the detect without the use of an image processing library (for learning purposes)? Can I look for specific bytes that tell me if the file is apng? Solutions in any language is welcome.

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• Improve responsiveness of $(...).click on touch interface

  - by Bram W.

  I need access to a web-based on screen keyboard which will be used on a touch interface. This example looks nice and functional, however when I try it on an iPad, the responsiveness it very low IMHO. It's not comfortable to use and sometimes whole words are misspelled due to slow response. Is there a way to improve the experience on this type of on screen keyboard? This implementation uses the $('#id').click(...); function to process the events. Is there a better way to achieve the goal of typing on the screen? Are there better plugins out there? Note: The final application will run on different types of devices. For several reasons, native on screen keyboards are no option.

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• Prevent Method call without Exception using @PreAuthorize Annotation

  - by Chepech

  Hi all. We are using Spring Security 3. We have a custom implementation of PermissionEvaluator that has this complex algorithm to grant or deny access at method level on the application. To do that we add a @PreAuthorize annotation to the method we want to protect (obviously). Everything is fine on that. However the behavior that we are looking for is that if a hasPermission call is denied, the protected method call only needs to be skipped, instead we are getting a 403 error each time that happens. Any ideas how to prevent that? You can find a different explanation of the problem here; AccessDeniedException handling during methodSecurityInterception

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• Deep Null checking, is there a better way?

  - by Mattias Konradsson

  We've all been there, we have some deep property like cake.frosting.berries.loader that we need to check if it's null so there's no exception. The way to do is is to use a short-circuiting if statement if (cake != null && cake.frosting != null && cake.frosting.berries != null) ... This strikes me however as not very elegant, there should perhaps be an easier way to check the entire chain and see if it comes up against a null variable/property. So is it possible using some extension method or would it be a language feature, or is it just a bad idea?

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• Implementing IComparer<T> For IComparer<DictionaryEntry>

  - by Phil Sandler

  I am using the ObservableSortedDictionary from Dr. WPF. The constructor looks like this: public ObservableSortedDictionary(IComparer<DictionaryEntry> comparer) I am really struggling to create an implementation that satisfies the constructor and works. My current code (that won't compile) is: public class TimeCreatedComparer<T> : IComparer<T> { public int Compare(T x, T y) { var myclass1 = (IMyClass)((DictionaryEntry)x).Value; var myclass2 = (IMyClass)((DictionaryEntry)y).Value; return myclass1.TimeCreated.CompareTo(myclass2.TimeCreated); } } It says I can't cast from T to DictionaryEntry. If I cast directly to IMyClass, it compiles, but I get a runtime error saying I can't cast from DictionaryEntry to IMyClass. At runtime, x and y are instances of DictionaryEntry, which each have the correct IMyClass as their Value.

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• Adding WCF service reference adds DataContract types too

  - by Avi Shilon

  Hi everybody, I've used Visual Studio's Add Service Reference feature to add a service (actually it is a workflow service, created in WF4 RC1, but I don't think this makes any difference), and it also added the DataContracts that the service uses. At first this seemed fine, because All I've had in the DataContracts was simply properties, with no implementations. But now I've added code in the constructor of one data contracts that initializes creates an instance of one of the properties that exposes a list of other DCs, and when I've updated the service reference via VS (2010 RC1), the implementation was not updated. What should I do? Should I use my DCs instead of the ones created by VS or should I use the ones VS created? I've noticed that the properties in the VS-generated DCs contain some additional logic for checking equality in the setters and they also implement some interfaces too (like IExtensibleDataObject and INotifyPropertyChanged) which might get handy I guess in the future (I'm not knowledgeable at WCF). Thank you for your time folks, Avi

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• Accessing E4X nodes having special characters in name without breaking binding chain in flex.

  - by Jonas

  I am using E4X to bind some values from xml in flex 3. There is a problem when xml tag's (or attribute's) name has special character in it: having xml content var xml:XML = <tag> <special-name att="val" /> </tag> special-name could not be accessed using xml.special-name.@att because it is interpreted as subtraction, on the other hand using square bracket notation xml['special-name'].@att breaks binding chain. Is there an elegant way to solve this (like special language syntax) without writing custom binding setters and listeners?

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• Naming convention in Objective C /C , start with "_"?

  - by Tattat

  Something I see ppl define the variable like this: b2World *_world; b2Body *_body; CCSprite *_ball; instead of b2World *world; b2Body *body; CCSprite *ball; I familiar with the second one, but not the first one. So, I checked the Wikipedia about naming convention: Names beginning with double underscore or an underscore and a capital letter are reserved for implementation (compiler, standard library) and should not be used (e.g. __reserved or _Reserved). So, is that any special meaning which is start with "_"? The wiki page.

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• Explain ML type inference to a C++ programmer

  - by Tsubasa Gomamoto

  How does ML perform the type inference in the following function definition: let add a b = a + b Is it like C++ templates where no type-checking is performed until the point of template instantiation after which if the type supports the necessary operations, the function works or else a compilation error is thrown ? i.e. for example, the following function template template <typename NumType> NumType add(NumType a, NumType b) { return a + b; } will work for add<int>(23, 11); but won't work for add<ostream>(cout, fout); Is what I am guessing is correct or ML type inference works differently? PS: Sorry for my poor English; it's not my native language.

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• Warning: XXX may not respond to YYY

  - by Aurel300

  Hey, I am making some stuff in Objective-C++... And I must say that I am a total newbie when it comes to the Objective-C part... I don't really want to learn it, I kinda just need it for accessing a few Mac APIs (ObjC is such a dumb language). So - compiling with g++ -x objective-c++ - and I somehow keep getting this warning: XXX may not respond to YYY First it was with a NSScreen, now it is with a NSWindow: NSWindow may not respond to +initWithContentRect:styleMask:backing:defer: I saw somewhere that I should cast it to id, but didn't work, throwing absolutely cryptic errors... So - WHAT does this warning actually mean and HOW am I supposed to make it stop?

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• In WebKitGtk+, how can I access parameters in an event listener?

  - by Matthew

  Here is an example in javascript of what I want to do: function handleDragStart(e) { e.dataTransfer.effectAllowed = 'move'; e.dataTransfer.setData('text/plain', 'some data'); } var dragSource = document.querySelector('#dragSource'); dragSource.addEventListener('dragstart', handleDragStart, false, null); But I am having trouble translating this to a GLib-based system. Here is an example in Vala: void on_dragstart(EventTarget event_target) { // How can I access the equivalent of e.dataTransfer? } WebKit.WebView web_view = ... WebKit.DOM.Document document = web_view.get_dom_document(); WebKit.DOM.Element drag_source = document.query_selector('#dragSource'); drag_source.add_event_listener("dragstart", (Callback) on_dragstart, false, null); While I am using Vala, an answer in any language interacting with WebKitGtk+ directly would be helpful.

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• How to best deal with photos passed to IFilter?

  - by sharptooth

  I'm implementing an IFilter for indexing image formats. One problem is photos - many users have tons of photos, photos are huge and loading and searching for text on them is time consuming. Yes, sometimes people use cameras instead of scanners for digitizing documents, but the potential problems IMO far outweight the possibility of encountering a document digitized with a photo camera. So my implementation will not extract text from photos at all. What should the IFilter do once it detects that a given file is a photo image - indicate an error or return empty text?

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• Implementing an interface with interface members

  - by jstark

  What is the proper way to implement an interface that has its own interface members? (am I saying that correctly?) Here's what I mean: public Interface IFoo { string Forty { get; set; } string Two { get; set; } } public Interface IBar { // other stuff... IFoo Answer { get; set; } } public class Foo : IFoo { public string Forty { get; set; } public string Two { get; set; } } public class Bar : IBar { // other stuff public Foo Answer { get; set; } //why doesnt' this work? } I've gotten around my problem using explicit interface implementation, but I'm wondering if there is a better way?

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• How do I create queries to SQL Server tables via Visual Studio when no knowledge about SQL nor Linq?

  - by Kent S. Clarkson

  Let´s be frank, my knowledge regarding SQL language is very low. Nevertheless, my boss gave me the task to build a database application using the following tools: SQL Server and Visual Studio 2008; C#. I use the VS DataSet as a local mirror of the SQL Server. And let´s be frank again, my understanding of the VS Query builder is also very small, I´m finding it quite confusing, actually. So no help to find from Query builder. And my knowledge of Linq is even lower... Perhaps I should mention that the deadline for the project is "aggressively" set, so I have no chance to learn enough about these things during the project. And I´m a bit stupid too, which is no help when it comes to challenges like this (on other occations it might be quite useful though) With these permissions, what should I do (except for killing myself or retire) to be able to query my tables in a sufficient way?

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• Cocoa -- getting a simple NSImageView to work

  - by William Jockusch

  I am confused about why this code does not display any image: In the app delegate: - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSRect rect = window.frame; rect.origin.x = 0; rect.origin.y = 0; BlueImageView *blueImageView = [[BlueImageView alloc]initWithFrame:rect]; window.contentView = blueImageView; // also tried [window.contentView addSubview: blueImageView]; } BlueImageView.h: @interface BlueImageView : NSImageView { } @end BlueImageView.m: @implementation BlueImageView - (id)initWithFrame:(NSRect)frame { self = [super initWithFrame:frame]; if (self) { [self setImage: [NSImage imageNamed:@"imagefile.png"]]; NSAssert(self.image, @""); NSLog (@"Initialized"); } return self; } - (void)drawRect:(NSRect)dirtyRect { } @end The file imagefile.png exists. The NSAssert is not causing an exception. The NSLog is firing. But no image shows up in the window.

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• XSL: Dead or not dead

  - by Seattle Leonard

  I'm currently taking on a new project at home. In this project I'm going to be generating HTML emails. For this purpose, I believe XSL to be a good candidate. However, I have heard people say that XSL is a dead language, and if it's not that it is on it's way out. In fact, MS has been very leary to support XSL 2.0. Personally I feel that any time you are going from text to text, it is a great tool. Such as: Generating HTML e-mails Creating Open Office Docs Generating another XML doc What are your thoughts? Is it dead, or is it still a viable, usefull tool?

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• Is it possible to programmatically talk to MSN messenger / Live messenger?

  - by Ceilingfish

  Hi chaps, I've been researching how to interact with the MSN messenger / Live messenger service programmatically and I can't find any real documentation on this. The documentation for the Live services only seem to implement in Javascript (they're here: http://dev.live.com/Messenger/) It would be possible to reverse engineer this API to obtain the web services that it is actually using, but I am guessing that they didn't provide the sources for a reason (which means that those web services aren't meant for direct access). However I can't find any other official APIs that allow programmatic access (more specifically no APIs that mention sockets, web services, or a proper programming language like Java or .Net). Does anyone know if an API like that exists?

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• frequency of objects in an array using Ruby

  - by eastafri

  If i had a list of balls each of which has a color property. how can i cleanly get the list of balls with the most frequent color. [m1,m2,m3,m4] say, m1.color = blue m2.color = blue m3.color = red m4.color = blue [m1,m2,m4] is the list of balls with the most frequent color My Approach is to do: [m1,m2,m3,m4].group_by{|ball| ball.color}.each do |samecolor| my_items = samecolor.count end where count is defined as class Array def count k =Hash.new(0) self.each{|x|k[x]+=1} k end end my_items will be a hash of frequencies foreach same color group. My implementation could be buggy and i feel there must be a better and more smarter way. any ideas please?

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• T-SQL: Build Nested Set From Parent-Child Relationship

  - by Peder Rice

  I have a table that stores my Customer hierarchy with a nested set (due to the specific design of the application, I wasn't able to leverage just a Customer/Parent Customer mapping table). To simplify maintenance of this table, I've built a couple of stored procedures to handle moving nodes around and creating new nodes, but it's significantly more work than maintaining a Customer/Parent Customer table. Further, these structures are very fragile. So I'm looking for a way to have a Customer/Parent Customer table and then convert that table to a nested set on demand. Does anyone have a link to such an implementation?

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• Any good jQuery plugins to awesomify my pagination?

  - by marcgg

  I have a basic pagination system that looks something like that: First | < Previous | 1, 2, [3], 4, 5 ... 100, 101, 102 | Next > | Last Nothing fancy really. I am looking at various plugins to improve the way the user would browse this, but so far I haven't found anything really new or interesting except: http://tympanus.net/jPaginate/ : interesting way of browsing between pages but still very classical in the realization http://cpojer.net/Scripts/Pagination/ : totally new way of doing pagination, but the implementation isn't perfect and it's not really usable. Do you guys have ideas on how I could improve the way my users browse through navigation? Are there any good jQuery plugins out there already doing that?

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• where does the professional sheen of a GUI application realistically come from?

  - by JW

  I have been playing around with php-gtk recently and in the past I have experimented with Java to make GUI 'hello world' apps. However both these types of applications have had a bit of a clunky (almost childish) look and feel to them. I cannot deny that they are handy for making apps for in-house use (and I totally respect the amount of community effort that goes into these projects). But I would not necessarily be proud to sell it as a commercial application with a price tag of, say, £450 or £1,000. If I wanted to make an application that had the look and feel of, say, Firefox for Windows, or Adobe xyz, what GUI/language should I use? Is the 'professional sheen' or smart look and feel down to the designer or is it the case that, no matter how good a designer is, picking the right GUI framework is essential to get that look?

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