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copied!<p>Just ran into this myself today and decided to dive deep.</p> <p>The reason you don't see in <code>ActiveSupport::Dependencies.autoload_paths</code> the paths you're adding to <code>config.autoload_paths</code> in <code>config/application.rb</code> is that they aren't copied over until the application is initialized. See <code>rails/engine.rb</code> in the <code>railties</code> gem:</p> <pre><code>module Rails class Engine < Railtie … # Set the paths from which Rails will automatically load source files, # and the load_once paths. # # This needs to be an initializer, since it needs to run once # per engine and get the engine as a block parameter initializer :set_autoload_paths, :before => :bootstrap_hook do |app| ActiveSupport::Dependencies.autoload_paths.unshift(*_all_autoload_paths) ActiveSupport::Dependencies.autoload_once_paths.unshift(*_all_autoload_once_paths) # Freeze so future modifications will fail rather than do nothing mysteriously config.autoload_paths.freeze config.eager_load_paths.freeze config.autoload_once_paths.freeze end … def _all_autoload_paths @_all_autoload_paths ||= (config.autoload_paths + config.eager_load_paths + config.autoload_once_paths).uniq end … end end </code></pre> <p>Were you by any chance trying to invoke <code>MyClass</code> from within <code>config/application.rb</code> or, even earlier, from a script or module that requires <code>config/application.rb</code>? If so, you'll have to explicitly require the file defining <code>MyClass</code>, e.g.:</p> <pre><code>require File.expand_path('../../somefolder/my_class', __FILE__) # now use MyClass </code></pre>

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