Setting engine specific settings in global environment files

development.rb

Dummy::Application.configure do
  # Settings specified here will take precedence over those in config/application.rb
  # <snip>
 
  config.my_setting = "bar"

end

engine.rb

module MyEngine
  class Engine < Rails::Engine
    config.before_initialize do |app|
      app.config.my_setting = "foo"
    end
  end
end

some_controller.rb

class SomeController < ApplicationController
  
  def index
    my_setting = Rails.application.config.my_setting
  end

end