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PORe-opening a class located in lib folder (Rails 3)
 

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    <p>Similar questions have been asked many times. However, I have slightly different scenario and I still to find a clean solution to the following problem while developing a Rails 3 app:</p> <p>I have a ruby code located in a single file. This code is one module <code>MyModule</code> which contains a bunch of classes. I can't modify this code because it's auto-generated by an external tool. The file name is <code>my_module.rb</code> and it resides in the <code>lib</code> folder. This is the usual place for a code which doesn't belong to the main web app. I made sure it is auto-loaded once I access MyModule in one of my app controllers by modifying <code>config.autoload_paths</code> setting in <code>application.rb</code>.</p> <p>Now I need to re-open one of the classes in <code>MyModule</code>. I created a separate file <code>some_class.rb</code> where I put the following code:</p> <pre> class MyModule::SomeClass def some_new_method ... end end </pre> <p>My question is: what is the best place to put this code? And what should be the name of the file?</p> <p>The things I tried:</p> <ol> <li>Placing the code into <code>initializers</code> folder. it works fine in production environment. However, it breaks in <code>development</code> because the code in <code>initiliazers</code> folder is loaded once when the server starts up and <code>lib</code> is reloaded on each request. So, the first request in development works fine, however, the subsequent requests fail. Also I don't like placing the code into <code>initializers</code> because it's not really initialization piece but rather a part of business logic.</li> <li>Placing the code into <code>lib</code> folder also doesn't work. It's not loaded. Only <code>my_module.rb</code> is.</li> <li>Placing the code into <code>lib</code> or some other folder under <code>app</code> and then explicitly <code>requir</code>ing it in controllers. Again it works in production but fails in development for the same reason aforementioned in case #1.</li> <li>I switched off auto-loading, placed both <code>my_module.rb</code> and <code>some_class.rb</code> into <code>lib</code> folder and <code>require</code>ed them in an initializer. I think this is the best approach. The downside is that I still have to create a custom initializer and the code is not loaded lazily.</li> </ol> <p>UPDATE: 5. Thanks to raggi's suggestion, with auto-loading switched on, I put <code>require_dependency 'some_class'</code> in my controller. In this case <code>some_class.rb</code> is loaded on each request in development mode. This is my preferred approach . However, it still requires some sort of <code>require</code> :)</p> <p>Remember that files in <code>lib</code> folder are auto-loaded lazily. Rails checks the folder only when you use modules or classes that rails can't find. The file name must follow the naming convention, hence the name <code>my_module.rb</code>.</p> <p>I wonder if there is a solution when both files are auto-loaded lazily <strong>without</strong> any <code>require</code> statements.</p>
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