Rails.root from engine

问题

I'm having some problem accessing Rails.root from my rails engine, that I'm creating. I need to fetch a yml config file from the main app.

Is there any "best practices" for handling configurations for your engines?

回答1:

Let's assume you have a module attribute for that.

# lib/my_engine.rb

module MyEngine

  mattr_accessor :app_root

end

Then you can load it from the initialize block like so:

# lib/my_engine/engine.rb

module MyEngine

  class Engine < Rails::Engine

    initializer "my_engine.load_app_root" do |app|

       MyEngine.app_root = app.root

    end

  end

end

回答2:

Instead use Rails.root use: MyEngine::Engine.root ;D

来源：https://stackoverflow.com/questions/11615635/rails-root-from-engine