Rails threadsafe! and Engines

If you're planning to use the combination of engines and threadsafe! you'll need to do some extra work. Due to a bug in Rails the engine load paths are not added to the eager_load_paths at startup time. This makes engines unavailable in threadsafe! mode.

Fortunately, working around this problem is simple. Just subclass the plugin loader like this:

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class EagerLoader < Rails::Plugin::Loader def add_plugin_load_paths super engines.each do |engine| configuration.eager_load_paths += engine.load_paths end end end

And wire up your new loader in your environment.rb:

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#require the plugin loader require File.join(File.dirname(__FILE__), '..', 'lib', 'eager_loader') Rails::Initializer.run do |config| #override the default loader config.plugin_loader = EagerLoader # ... end