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copied!<p>There are two ways that files get loaded in Rails:</p> <ul> <li>It is registered in the autoload process, and you reference a constant that corresponds to the file name. For instance, if you have <code>app/controllers/pages_controller.rb</code> and reference PagesController, <code>app/controllers/pages_controller.rb</code> will automatically be loaded. This happens for a preset list of directories in the load path. This is a feature of Rails, and is not part of the normal Ruby load process.</li> <li>Files are explicitly <code>require</code>d. If a file is <code>require</code>d, Ruby looks through the entire list of paths in your load paths, and find the first case where the file you <code>require</code>d is in the load path. You can see the entire load path by inspecting $LOAD_PATH (an alias for $:).</li> </ul> <p>Since <code>lib</code> is in your load path, you have two options: either name your files with the same names as the constants, so Rails will automatically pick them up when you reference the constant in question, or explicitly require the module.</p> <p>I also notice that you might be confused about another thing. ApplicationController is <strong>not</strong> the root object in the system. Observe:</p> <pre><code>module MyModule def im_awesome puts "#{self} is so awesome" end end class ApplicationController < ActionController::Base include MyModule end class AnotherClass end AnotherClass.new.im_awesome # NoMethodError: undefined method `im_awesome' for #<AnotherClass:0x101208ad0> </code></pre> <p>You will need to include the module into whatever class you want to use it in.</p> <pre><code>class AnotherClass include MyModule end AnotherClass.new.im_awesome # AnotherClass is so awesome </code></pre> <p>Of course, in order to be able to include the module in the first place, you'll need to have it available (using either of the techniques above).</p>

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