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  • Why MyModel.all works in Rails ?

    - by AntonAL
    Hi, i don't understand this little thing: Suppose, we have "Person" model class Person < ActiveRecord::Base end Why Person.all works ? Person.all.each { |p| do_something } This syntax tells us, that we have Person class-object instanciated somewhere ? Or is it some convention over configuration case ?

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  • How to make NetBeans IDE 6.8 show svn commit status (especially for "dirty" files)

    - by Andrew M. Andrews III
    I just switched from Eclipse to NetBeans IDE 6.8 for my PHP/Ajax development. Eclipse always showed a little hard disk symbol over the file icon for files that were in sync with the svn repository, and an asterisk for files with changes that have not been committed. Is there a way to see the commit status in NetBeans? If not, what is your preferred way of recognizing which files to commit?

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  • If a jQuery function calls itself in its completion callback, is that a recursive danger to the stac

    - by NXT
    Hi, I'm writing a little jQuery component that animates in response to button presses and also should go automatically as well. I was just wondering if this function recursive or not, I can't quite work it out. function animate_next_internal() { $('#sc_thumbnails').animate( { top: '-=106' }, 500, function() { animate_next_internal(); } ); } My actual function is more complicated to allow for stops and starts, this is just a simplified example.

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  • Sending an int array through Winsocks

    - by seed
    I'm trying to send an int array through Winsocks. I might be wrong, but I'm pretty sure only a char* is supported so I'm kind of stuck on how to do this properly. There are also problems with little/big edian, so what would be a good way to do this? I've already asked a question of converting int array to char but it was recommended to start a new thread on this in the networking section instead.

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  • 2 Questions about nUnit.

    - by Night Walker
    Hi all I have 2 questions about functionality of nunit. What is the difference between [TestFixtureSetUp] and [SetUp] attributes ? I am writing a some class with tests and I see that half of my test functions need one setup, And an another half needs another set up. How can I have in one class two little different SetUp functions that are called with different functions Thanks.

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  • DataContractSerializer: preserve string member that happens to be raw xml?

    - by bwerks
    I'm a little inexperienced with the DataContract paradigm, and I'm running into a deserialization problem. I have a field that's a string, but it contains xml and it's not being deserialized correctly. I have a feeling that it's because the DCS is treating it as input to the serializer and not as an opaque string object. Is there some way to mark a DataMember in code to say "This thing is a string, don't treat its contents as xml" similar to XmlIgnore? Thanks!

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  • Polishing an user interface

    - by elec
    Looking for examples of some "final touches" to enhance an existing (raw) user interface. I.e nothing related to the core functionalities of the application, but rather examples of all these little details which give an application a "polished" look (new fonts, change in layout, more descriptive labels...others ?) The target platform will be a mobile platform (android/iphone). Note that I'm severly graphically impaired regarding colour and shape combinations, so anything too sophisticated will probably pass me by completely ;)

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  • row operation in same table and same coloumns

    - by Raj
    Hi! i have a little problem to discuss i hope it will easy for you. suppose i have table A with 2 columns as item price milk 25 milk 50 milk 100 Butter 25 Butter 100 Butter 200 now i want to display a table B derived from table A as item price growth rate milk 0 milk 100 milk 100 Butter 100 Butter 200 Butter 100 formula for growth rate for row1 is ((row[1]-row[0])/row[0])*100 eg for 1st row ((50-25)/25)*100 can you suggest a SQl Query for it

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  • Javascript: Enable checkboxes list when a checkbox is checked (With Prototype)

    - by BoDiE2003
    Guys, Ive been using jquery to do this, but now I need to do it with Prototype and Im little confused due lack of documentation I have 2 lists of check boxes First List: Check box 1 Check box 2 Second list: Check box x check box y check box z I need the JS code, using prototype to work like this: Second list, remains disabled unless I check one of the checkboxes of the First List. Any suggestions, or help, please! Thankyou.

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  • importing class and its function from another file

    - by user343934
    Hi everyone, I am having little problem with importing classes in python. My work flow goes like this index.py class Template: def header(): def body(): def form(): def footer(): display.py I want to call function header(), body() and footer () in my display.py page. Will anyone make me clear about this issue in python. Thanks for your concern.

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  • clarification on the concept of "web service"

    - by udit
    Im a little confused on the varying definitions and implementations of web services available as implementations. Need some clarification please. Ones I have used till now: If a vendor gives me a specific format of XML that I can send populated with data to request and I make a simple HTTP POST over the internet passing in the XML String as the payload, is this a web service call ? If so, is there a specific name to it, this kind of web service ? Because obviously, it does not use anything like Axis, WSDL or SOAP to establish this connection. A variant of this is If the vendor gives me an XSD, I use JAXB to make a java class out of it and pass in the serialized version of the object, which eventually works out to be the same as option 1. RESTful web service: Vendor gives me a URL like http://restfulservice/products and I can make HTTP Requests to the URL and depending on what HTTP verb I use, the appropropriate action is called and the response sent over the wire. Ones I have only read about\ have a vague idea about SOAP. How does this work?.. Ive read the W3Schools tutorial and I undertsand that there is a very specific form of XML that is standardized according to W3C standards that we use to pass the same kind of messages as we did in option 1. But how does this work in real life? Vendor sends me what? Do I generate classes? Do I serialize some objects and http post them over to an address? Or do the generated objects themselves have connection methods that will do them for me? What about WSDL? When does a vendor send me WSDL and what do I do with it ? I guess I can generate classes from it. If yes, then what do I do with the generated classes ? When do I need that axis jar to generate classes from something that the vendor sends ? As you can see, I have some clear and other mostly vague ideas about the different kinds of web services available. would help if someone ould clarify and\or point to more real-world resources. I've looked a little bit into Java Web Services on the internet and the numerous four letter acronyms that get thrown at me make me dizzy. Thanks

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  • How to replicate CoreData NSFetchedResultController with plain SQLite?

    - by jchatard
    I would like to replicate the notification sort of system provided with CoreData NSFetchedResultController which with really little enables us to update a tableView based on events such as Insert/Update/Delete of objects represented as Cells. I'm currently using SQLitePersistentObjects as a Database abstraction layer: http://code.google.com/p/sqlitepersistentobjects/ If you have any idea or something working or at least advices I'd be very happy! Thank you!

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  • Can someone explain this 'double negative' trick?

    - by ProfessionalAmateur
    Hello, I am by no means an expert at javascript, but I have been reading Dave Pilgrim's "Dive into HTML5" webpage and he mentioned something that I would like a better understanding of. He states: "Finally, you use the double-negative trick to force the result to a Boolean value (true or false)." function supports_canvas() { return !!document.createElement('canvas').getContext; } If anyone can explain this a little better I would appreciate it!

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  • Are there algorithms for increasing resolution of an image?

    - by David
    Are there any algorithms or tools that can increase the resolution of an image - besides just a simple zoom that makes each individual pixel in the image a little larger? I realize that such an algorithm would have to invent pixels that don't really exist in the original image, but I figured there might be some algorithm that could intelligently figure out what pixels to add to the image to increase its resolution.

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  • How do I get the Math equation of Python Algorithm?

    - by Gabriel
    ok so I am feeling a little stupid for not knowing this, but a coworker asked so I am asking here: I have written a python algorithm that solves his problem. given x 0 add all numbers together from 1 to x. def fac(x): if x > 0: return x + fac(x - 1) else: return 0 fac(10) 55 first what is this type of equation is this and what is the correct way to get this answer as it is clearly easier using some other method?

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  • Need to have testing server work with https: but don't have an SSL

    - by Cyrcle
    I'm working on an online store. I have it setup on my testing server. I'm having a problem where when it goes to the checkout functions it wants to start calling https pages. I don't have an SSL certificate for this server. Is there something I can do with Apache to get this to work? Mod_Rewrite perhaps? I've played a little with rewrites but haven't had any success.

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  • Best FTP wrapper for iPhone

    - by jamone
    I know you use the C based networking API to do FTP communication but I'd prefer to use something a little higher level. I've seen a few Objective-C based wrappers but I'm not sure what to use. I don't need that complex of FTP interaction. Its just the typical create/delete dirs, upload/download files... What do you recommend?

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  • Creating Unix Commands with Xcode

    - by golfromeo
    Hello, I'm trying to make a Terminal Unix command with XCode, and I'm having a little trouble... What I've been doing is creating a "Standard Tool" written in C in XCode, then copying the produced executable to Developer/Tools/. What am I doing wrong? Thanks for any help in advance.

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  • Programming Language Choices for High Integrity Systems

    - by Finbarr
    What programming languages are a good choice for High Integrity Systems? An example of a bad choice is Java as there is a considerable amount of code that is inaccessible to the programmer. I am looking for examples of strongly typed, block structured languages where the programmer is responsible for 100% of the code, and there is as little interference from things like a JVM as possible. Compilers will obviously be an issue. Language must have a complete and unambiguous definition.

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  • How does the bitwise operator '^' work?

    - by SpawnCxy
    I'm a little confused when I see the output of following code: $x = "a"; $y = "b"; $x ^= $y; $y ^= $x; $x ^= $y; echo $x; //got b echo $y; //got a And I wonder how does the operator ^ work here?Explanations with clarity would be greatly appreciated!

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