How to get the list of all engines in Rails 3 app

Question

According to Rails engines extending functionality in Rails 2.x one could do

Rails::Initializer.new(Rails.configuration).plugin_loader.engines

Answer 1

This has changed with Rails 4.1. The accepted answer is deprecated and the new way to get the installed Engines for a Rails application is now:

::Rails::Engine.subclasses.map(&:instance)

Here's a reference to the commit in github making the change (and also showing how it was implemented after initial deprecation...)

If you need to use the previous solution from Rails 4.1:

module Rails
    class Engine
        class Railties
            def self.engines
                @engines ||= Rails::Engine.subclasses.map(&:instance)
            end
        end
    end
end