The following code activates autoloading using ActiveSupport 3.x:
require 'active_support' require 'active_support/dependencies' relative_load_paths = %w[app/controllers app/models] ActiveSupport::Dependencies.autoload_paths += relative_load_paths
prefer: http://makandracards.com/makandra/8879-use-activesupport-autoloading-outside-of-rails
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