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  • Modules vs. Classes and their influence on descendants of ActiveRecord::Base

    - by Chris
    Here's a Ruby OO head scratcher for ya, brought about by this Rails scenario: class Product < ActiveRecord::Base has_many(:prices) # define private helper methods end module PrintProduct attr_accessor(:isbn) # override methods in ActiveRecord::Base end class Book < Product include PrintProduct end Product is the base class of all products. Books are kept in the products table via STI. The PrintProduct module brings some common behavior and state to descendants of Product. Book is used inside fields_for blocks in views. This works for me, but I found some odd behavior: After form submission, inside my controller, if I call a method on a book that is defined in PrintProduct, and that method calls a helper method defined in Product, which in turn calls the prices method defined by has_many, I'll get an error complaining that Book#prices is not found. Why is that? Book is a direct descendant of Product! More interesting is the following.. As I developed this hierarchy PrintProduct started to become more of an abstract ActiveRecord::Base, so I thought it prudent to redefine everything as such: class Product < ActiveRecord::Base end class PrintProduct < Product end class Book < PrintProduct end All method definitions, etc. are the same. In this case, however, my web form won't load because the attributes defined by attr_accessor (which are "virtual attributes" referenced by the form but not persisted in the DB) aren't found. I'll get an error saying that there is no method Book#isbn. Why is that?? I can't see a reason why the attr_accessor attributes are not found inside my form's fields_for block when PrintProduct is a class, but they are found when PrintProduct is a Module. Any insight would be appreciated. I'm dying to know why these errors are occurring!

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  • Can my tortoise vs. hare race be improved?

    - by FredOverflow
    Here is my code for detecting cycles in a linked list: do { hare = hare.next(); if (hare == back) return; hare = hare.next(); if (hare == back) return; tortoise = tortoise.next(); } while (tortoise != hare); throw new AssertionError("cyclic linkage"); Is there a way to get rid of the code duplication inside the loop? Am I right in assuming that I don't need a check after making the tortoise take a step forward? As I see it, the tortoise can never reach the end of the list before the hare (contrary to the fable). Any other ways to simplify/beautify this code?

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  • Singletons vs. Application Context in Android?

    - by mschonaker
    Recalling this post enumerating several problems of using singletons and having seen several examples of Android applications using singleton pattern, I wonder if it's a good idea to use Singletons instead of single instances shared through global application state (subclassing android.os.Application and obtaining it through context.getApplication()). What advantages/drawbacks would have both mechanisms? To be honest, I expect the same answer in this post http://stackoverflow.com/questions/2709071/singleton-pattern-with-web-application-not-a-good-idea but applied to Android. Am I correct? What's different in DalvikVM otherwise? EDIT: I would like to have opinions on several aspects involved: Synchronization Reusability Testing Thanks in advance.

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  • VS2010 possible to convert projects back to VS2008?

    - by JL
    As you all know the VS 2010 RC is out for MSDN subcribers. Unfortunately I guess I have the same problem as some of you, in that the company I work for wants to continue keeping our projects on VS 2008. I would like to know if its possible for me to work with VS 21010, then later convert my projects back to VS2008? I intend to use v3 of the framework for this particular project. Thanks in advance..

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  • Stored procedure with output parameters vs. table-valued function?

    - by abatishchev
    Which approach is better to use if I need a member (sp or func) returning 2 parameters: CREATE PROCEDURE Test @in INT, @outID INT OUT, @amount DECIMAL OUT AS BEGIN ... END or CREATE FUNCTION Test ( @in INT ) RETURNS @ret TABLE (outID INT, amount DECIMAL) AS BEGIN ... END What are pros and cons of each approach considering that the result will passed to another stored procedure: EXEC Foobar @outID, @outAmount

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  • Interface Builder vs Cocos 2D - how choice the best for your app.

    - by baDa
    Hello everyone! I was a flash developer for 3 years, and in the last 5 months, i begin the iphone development, i do 2 applications with interface builder for clients, and now i really want to do a little game, is quite simple, one match 3! I made the engine in interface builder, and seens good to me! But after i read some posts, i really want to try it in the cocos2D! So, in 2 days i rewrite all my first engine for cocos2D, very annoying upsidedown coordinates but ok, i really do! But the performance side by side with interface builder version is really scare! Many Many slow downs at the cocos2d side! And the animation seens bugged to me! I really scare! I really don't know what is the best choice for a simple game. And i want some opinions: Using cocos2d when need some physics? When we have many objects at screen? What is the performance boost i have with cocos2D? I have how to share this 2 applications with you guys?! Without your UID?!

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  • Can you recommend an easy to use easy to develop CMS?

    - by el_at_yahoo
    We need some easy way to manage web sites at our company, and we are evaluating some CMS tools for this purpose. We do not yet know what features the sites will need to have (but it will definitely be something with lots of functionalities), so we are looking for something with lots of features and more importantly to be easily extensible (if it does not have some feature, we at least want to be able to build-it by ourselves). We have no experience with Content Management Systems but we do with Java, so it has to be something written in Java. We evaluated some tools and from our perspective the following seem the promising of them (in no particular order): OpenCMS dotCMS (Community Edition vs Enterprise Edition) InfoGlue Alfresco (EE vs CE) Magnolia (EE vs EE Pro vs CE) Jahia (CE vs EE) Since we have no experience with either one of them, we were wondering if someone of you who have can share some information about how good they are or how easily they can be used and extended. I know similar questions have been asked on SO and I also know this is highly subjective and people will vote for closing it as soon as it is posted, but for us it is important to know what difficulties other people have been facing in using the above tools (we don’t want to walk a path that takes nowhere if other people already know it leads nowhere). Others could then vote on the posted answers if they agree or not. From your experience, which from the above mentioned CMSs is the more easily extensible, the easier to use, the easiest to learn etc? Thank you and Happy Holidays to all.

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  • Prims vs Polys: what are the pros and cons of each?

    - by Richard Inglis
    I've noticed that most 3d gaming/rendering environments represent solids as a mesh of (usually triangular) 3d polygons. However some examples, such as Second Life, or PovRay use solids built from a set of 3d primitives (cube, sphere, cone, torus etc) on which various operations can be performed to create more complex shapes. So my question is: why choose one method over the other for representing 3d data? I can see there might be benefits for complex ray-tracing operations to be able to describe a surface as a single mathematical function (like PovRay does), but SL surely isn't attempting anything so ambitious with their rendering engine. Equally, I can imagine it might be more bandwidth-efficient to serve descriptions of generalised solids instead of arbitrary meshes, but is it really worth the downside that SL suffers from (ie modelling stuff is really hard, and usually the results are ugly) - was this just a bad decision made early in SL's development that they're now stuck with? Or is it an artefact of what's easiest to implement in OpenGL?

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  • Custom components vs default components in GUI Design. Which is more practical? (.NET)

    - by AlexRednic
    Ok, so is it better to create my own components (Either inherit them from existing ones or creating them from scratch) or to use the ones that come by default? I'm asking this under the umbrella of scalability, overhead and other factors that my contribute on each of the choices. UPDATE: Sorry if I'm to vague. I don't really know how to explain myself better. Isn't it a good idea to inherit each default component? For example what if I'm to design a rather large application and for example i need to change the display format on a DateTimePicker. Wouldn't it better to think ahead and inherit it and use the inherited component instead of the defaults? But, wouldn't it add a lot of overhead in small applications?

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  • Indexed key vs indexed separate columns, which one is faster ?

    - by Jerry
    In MYSQL, from a pure performance perspective, if I have a table with large amount of data with 10/1 read/write ratio. is it faster in read/write performance to have 4 search criteria in separate columns and all indexed or have them combined in to one single string acting as a key and store in one indexed column ? e.g. say this table with 5 columns, first name, last name, sex, country and file where the first four columns will ALWAYS be given as a part of search parameters in a search or have a table with two columns, key and file. where the value of key can be john-smith-male-australia ?? I don't quite get the pros and cons. the point I try to stress is the fact that all parameters will be given.in a search.

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  • ubuntu on virtual machine vs ubuntu install, what the difference?

    - by Yosef
    Hi, I have windows xp in my work and i programming on zend framework. I need to install ubuntu for execute doctrine orm commands from linux console, I faile to do it on windows. I thinking about 2 option of UBUNTU installation: 1.install ubuntu 10.04 on Virtual Box (Sun Virtual Machine). 2.create new primary partition and install ubuntu 10.04 directly. Which options do you suggest to do? Thanks

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  • Flash content in eLearning: one SWF vs. many?

    - by loucadro
    I am designing a Flash-based language course, and I am not sure which architecture I have to choose. The content won't be uploaded to the Internet, it will be used only locally. Possible architectures: 1) A single SWF with all the data stored internally - it seems a rather clumsy and inefficient way (or it's not?). 2) To make a Flash-based interface, and to keep the data saved in a MySQL database. It presumably allows to organize the content better, avoiding self-repetitions. The problem is that the language teacher (who is not an IT specialist) will have to install additional software to handle MySQL. 3) To make a number of separate SWF files, and to make a simple HTML-file with the index. (and some other solutions I didn't think of) Which is the right architecture, most usable for the teacher and most elegant from the IT point of view?

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  • Comments on this assumption about running on dev server vs a real instance in app engine (python)?

    - by Jacob Oscarson
    Hello app engineers! I'm on an app engine project where I'd like to put in a link to a Javascript test runner that I'd like to only exist when running the development server. I've made some experiments on a local shell with configuration loaded using the technique found in NoseGAE versus live on the 'App Engine Console' [1] and it looks to me like a distinction btw real instance and dev server is the presence of the module google.appengine.tools. Which lead me to this utility function: def is_dev(): """ Tells us if we're running under the development server or not. :return: ``True`` if the code is running under the development server. """ try: from google.appengine import tools return True except ImportError: return False The question (finally!) would be: is this a bad idea? And in that case, can anyone suggest a better approach? [1] http://con.appspot.com/console/ (try it! very handy indeed)

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  • How to install ASP.NET MVC 2 templates after already installing VS Web Dev 2010 first?

    - by Lucas McCoy
    First off these questions are related but do not fix my problem: http://stackoverflow.com/questions/2499934/ http://stackoverflow.com/questions/652836/ I have installed Visual Studio Web Developer Express Edition 2010, then I installed MVC 2. Now I can successfully run a MVC 2 application, however I have to do the manual imports of the namespaces and stuff. How can I install the templates?

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  • Decorators vs. classes in python web development.

    - by Tristan
    I've noticed three main ways Python web frameworks deal request handing: decorators, controller classes with methods for individual requests, and request classes with methods for GET/POST. I'm curious about the virtues of these three approaches. Are there major advantages or disadvantages to any of these approaches? To fix ideas, here are three examples. Bottle uses decorators: @route('/') def index(): return 'Hello World!' Pylons uses controller classes: class HelloController(BaseController): def index(self): return 'Hello World' Tornado uses request handler classes with methods for types: class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello, world") Which style is the best practice?

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  • jquery validation plugin - different treatment for display errors vs. clearing errors

    - by RyOnLife
    I am using the popular jQuery Validation Plugin. It's very flexible with regards to when validations are run (onsubmit, onfocusout, onkeyup, etc.). When validations do run, as appropriate, errors are both displayed and cleared. Without hacking the plugin core, I'd like a way to split the behavior so: Errors are only displayed onsubmit But if the user subsequently enters a valid response, errors are cleared onsubmit, onfocusout, etc. Just trying to create a better user experience: Only yell at them when they submit, yet still get the errors out of their face as soon as possible. When I ran through the options, I didn't see the callbacks necessary to accomplish this. I'd like to make it work without having to hack the plugin core. Anyone have some insights? Thanks.

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