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  • post_save signal on m2m field

    - by Dmitry Shevchenko
    I have a pretty generic Article model, with m2m relation to Tag model. I want to keep count of each tag usage, i think the best way would be to denormalise count field on Tag model and update it each time Article being saved. How can i accomplish this, or maybe there's a better way?

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  • Qt vs .NET - a few comparisons [closed]

    - by Pirate for Profit
    Event Handling In Qt the event handling system you just emit signals when something cool happens and then catch them in slots, for instance emit valueChanged(int percent, bool something); and void MyCatcherObj::valueChanged(int p, bool ok){} blocking them and disconnecting them when needed, doing it across threads... once you get the hang of it, it just seems a lot more natural and intuitive than the way the .NET event handling is set up (you know, object sender, CustomEventArgs e). And I'm not just talking about syntax, because in the end the .NET delegate crap is the bomb. I'm also talking about in more than just reflection (because, yes, .NET obviously has much stronger reflection capabilities). I'm talking about in the way the system feels to a human being. Qt wins hands down i m o. Basically, the footprints make more sense and you can visualize the project easier without the clunky event handling system. I wish I could it explain it better. The only thing is, I do love some of the ease of C# compared to C++ and .NET's assembly architecture. That is a big bonus for modular projects, which are a PITA to do in C++. Database Ease of Doing Crap Also what about datasets and database manipulations. I think .net wins here but I'm not sure. Threading/Conccurency How do you guys think of the threading? In .NET, all I've ever done is make like a list of master worker threads with locks. I like QConcurrentFramework, you don't worry about locks or anything, and with the ease of the signal slot system across threads it's nice to get notified about the progress of things. Memory Usage Also what do you think of the overall memory usage comparison. Is the .NET garbage collector pretty on the ball and quick compared to the instantaneous nature of native memory management? Or does it just let programs leak up a storm and lag the computer then clean it up when it's about to really lag? However, I am a n00b who doesn't know what I'm talking about, please school me on the subject.

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  • Can Gobby/Sobby be used for collaborative edition for a team of developers ?

    - by Jerome WAGNER
    Hello, Gobby/Sobby is an open source client/server for collaborative edition of plain text file (source code). My question is 4-fold : Can you share any real-life usage of Gobby/Sobby for development among a group of physically separated developers ? Is the project mature enough as a productivity tool ? What are the working use cases ? What versions should be used ? (It seems 'undo' feature is not yet officially packaged) Thanks Jerome

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  • jQuery mousemove performance

    - by Colby77
    Hi, When I bind a mousemove event to an element it is working smoothly with every browser except Internet Explorer. With IE the CPU usage is way too much and some associated things (eg. tooltip) are ugly. Is there any way I could rid of the performance problem? (yeah I know, don't use IE :))

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  • DotNetOpenAuth oAuth in ASP.NET MVC

    - by nikmd23
    I'm trying to understand how to apply the oAuth consumer library from DotNetOpenAuth in the context of ASP.NET MVC. oAuth is new to me, and the library doesn't seem very simple. Does anyone have a sample of leveraging this library, for this usage, in ASP.NET MVC?

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  • Learning to write a compiler

    - by Anton
    Preferred Languages : C/C++, Java, and Ruby I am looking for some helpful books/tutorials on how to write your own compiler simply for educational purposes. I am most familiar with C/C++, Java, and Ruby so I prefer resources that involve one of those three, but any good resource is acceptable.

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  • how to build a 3statetree in flex

    - by david Lnn
    hi all I want build a 3statetree with checkbox,I had got the resource from cookbook,but I don't know how to use it with json, and how can i click one node then send the request to server and expand the subnode after receive the json data from server. thank you,thank you.

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  • fileToSTring keeps on returning " "

    - by karikari
    I managed to get this code to compile with out error. But somehow it did not return the strings that I wrote inside file1.txt and file.txt that I pass its path through str1 and str2. My objective is to use this open source library to measure the similarity between strings contains inside 2 text files. Inside the its Javadoc, its states that ... public static java.lang.StringBuffer fileToString(java.io.File f) private call to load a file and return its content as a string. Parameters: f - a file for which to load its content Returns: a string containing the files contents or "" if empty or not present Here's is my modified code trying to use the FileLoader function, but fails to return the strings inside the file. The end result keeps on returning me the "" . I do not know where is my fault: package uk.ac.shef.wit.simmetrics; import java.io.File; import uk.ac.shef.wit.simmetrics.similaritymetrics.*; import uk.ac.shef.wit.simmetrics.utils.*; public class SimpleExample { public static void main(final String[] args) { if(args.length != 2) { usage(); } else { String str1 = "arg[0]"; String str2 = "arg[1]"; File objFile1 = new File(str1); File objFile2 = new File(str2); FileLoader obj1 = new FileLoader(); FileLoader obj2 = new FileLoader(); str1 = obj1.fileToString(objFile1).toString(); str2 = obj2.fileToString(objFile2).toString(); System.out.println(str1); System.out.println(str2); AbstractStringMetric metric = new MongeElkan(); //this single line performs the similarity test float result = metric.getSimilarity(str1, str2); //outputs the results outputResult(result, metric, str1, str2); } } private static void outputResult(final float result, final AbstractStringMetric metric, final String str1, final String str2) { System.out.println("Using Metric " + metric.getShortDescriptionString() + " on strings \"" + str1 + "\" & \"" + str2 + "\" gives a similarity score of " + result); } private static void usage() { System.out.println("Performs a rudimentary string metric comparison from the arguments given.\n\tArgs:\n\t\t1) String1 to compare\n\t\t2)String2 to compare\n\n\tReturns:\n\t\tA standard output (command line of the similarity metric with the given test strings, for more details of this simple class please see the SimpleExample.java source file)"); } }

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  • Android Video View - Fails to Load file from SD Card

    - by MasterGaurav
    Hi, I have an activity that uses VideoView and MediaController. I have a .mp4 file. (1) When I put the file in res/raw folder, I can play the video using Uri.parse("android.resource://<package>/" + R.raw.id_video) (2) However, when I put the same file in the file-system, it plays properly. I use videoView.setVideoPath("/sdcard/myfile.mp4"); What can be the problem? -- Happy Hacking, Gaurav www.mastergaurav.com

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  • Create Embedded Resources problem

    - by Night Walker
    I am trying to add an Embedded Resource I am doing it like it is written in following tutorial http://msdn.microsoft.com/en-us/library/e2c9s1d7%28VS.80%29.aspx But I cant the Persistence property from Linked at compile time To Embedded in .resx It always gray at Linked at compile time . Any idea why i have this problem ? Thanks .

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  • Profile memory-performance for part of an rails project

    - by Florian Pilz
    I want to test the profile usage of an important library-class of my rails-project. It uses ActiveRecord so I need all rails dependencies to profile it. As far as I know, I need a patched ruby (rubygc) so script/profile and script/benchmark can track memory usage. I tried to follow this official guide to patch the source code of ruby 1.8.6 (p399) and 1.8.7 (p248), but both fail with the following message: patching file gc.c Hunk #2 succeeded at 50 with fuzz 2 (offset 2 lines). Hunk #3 succeeded at 87 with fuzz 2 (offset 6 lines). Hunk #4 succeeded at 153 with fuzz 1 (offset 45 lines). Hunk #5 succeeded at 409 with fuzz 2 (offset 274 lines). Hunk #6 FAILED at 462. Hunk #7 FAILED at 506. Hunk #8 FAILED at 520. Hunk #9 FAILED at 745. Hunk #10 FAILED at 754. Hunk #11 FAILED at 923. Hunk #12 succeeded at 711 (offset 46 lines). Hunk #13 succeeded at 730 (offset 46 lines). Hunk #14 succeeded at 766 (offset 55 lines). Hunk #15 succeeded at 1428 (offset 87 lines). Hunk #16 succeeded at 1492 (offset 89 lines). Hunk #17 FAILED at 1541. Hunk #18 FAILED at 1551. Hunk #19 succeeded at 1571 (offset 91 lines). Hunk #20 succeeded at 1592 (offset 91 lines). Hunk #21 succeeded at 1601 (offset 91 lines). Hunk #22 succeeded at 1826 (offset 108 lines). Hunk #23 succeeded at 1843 (offset 108 lines). Hunk #24 succeeded at 1926 (offset 108 lines). Hunk #25 succeeded at 2118 (offset 108 lines). Hunk #26 succeeded at 2563 (offset 100 lines). Hunk #27 succeeded at 2611 with fuzz 1 (offset 102 lines). Hunk #28 succeeded at 2628 (offset 102 lines). 8 out of 28 hunks FAILED -- saving rejects to file gc.c.rej patching file intern.h Hunk #1 succeeded at 268 (offset 15 lines). I also tried to use ruby-prof, but I always get the error "uninitialized constant RubyProf::Test". I don't know how to use the gem "memory" and neither "memprof" nor "bleak_house" could be installed successfully. If I get a patched ruby running, I should be fine. But any other possibility to profile the memory of library classes are welcome. Thanks for helping!

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  • Adding resources to solution explorer in experimental hive

    - by Brian Webb
    Hi, I'm currently working on a project using DSL tools in Visual Studio 2008. Is there a way to automatically add a resource into the solution explorer of the experimental hive at runtime? I'm creating new diagrams based on what is on screen, and saving them into the directory the project is stored in. I would like to know if there is a way to get them to automatically get added to the solution explorer? (I don't want to have to drag the files in manually each time)

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  • Efficiency questions

    - by rayman
    Hi, I have to manage XML documents and Strings in my app. In terms of efficiency and memory usage, will a collection like ArrayList be much more expensive than String[]? Also, I could store the content as a regular String or XML. Is working with XML also more expensive? (When I say expensive, I am referring to the use of system resources.) If there are differences, are they significant? Thanks, Ray.

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  • When should automation begin?

    - by onesith
    I want to start implementing automation. I just don't know if this would be a good use of resource. The application is growing at an exponential rate but i don't know at what point does automation benefits testing. Can you give me reasons why you would automate even though you have manual testers?

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  • How to use Linq with Castle ActiveRecord

    - by Ronnie Overby
    I am playing around with Castle ActiveRecord and noticed that the download included the file, Castle.ActiveRecord.Linq.dll. I haven't found any documentation for using Linq with ActiveRecord, only some old blog posts. What is the usage pattern? Is Castle.ActiveRecord.Linq ready for production use? I'm using reflector, pending an answer.

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  • How to do Map this or Add to calendar like gmail?

    - by dhaval
    How would gmail have implemented this feature? What technologies go behind enabling such features? Any pointers or programming resource would be useful? It could be language neutral or specific to any language? Do you think they do something with antlr etc., to achieve the above?

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  • rvm and different versions of a system library

    - by Guilherme Silveira
    I need to run a set of tests against the same ruby version and same gemset but with different versions of a .so library. Therefor I need to have two ruby installations (for the same version 1.8.7), each one pointing to a different set of .so files. How can I do that? Gemset usage is already too late because library binding is done when rvm install installs a ruby version.

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  • Is this a valid quine?

    - by fsm
    def start(fileName): fileReader = open(fileName) for row in fileReader: print row, if __name__ == "__main__": import sys if len(sys.argv) <= 1: print "usage quine /path/to/file" sys.exit(-1) fileName = sys.argv[0] start(fileName) python quine.py foo

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  • Unknown Curl error

    - by Kaido
    Hey i got small problem getting an unknown curl error from my script "curl_error(): 180 is not a valid cURL handle resource". Im not able to find any recourses about that error so maybe anyone has any experience with this. Thanks already. heres the part which causes the error $resp = curl_error($ch); error_log(date('Y M D h:s:m '). ": $current error: " .curl_error($ch)."\n", 3, '../../usererrors/'.$username.'errors');

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