CODEWITHSUNDEEP
ruby-on-rails-4rails-engines
user938363
user938363

Reputation: 10360

Is before_action in application controller executed before routes.rb and models are loaded?

For a before_action in Rails engine's application controller, when a user requests an action from the engine, is the before_action executed before engine's routes.rb and models are loaded (or some procedure/tool which allows us to find out the executing order. Debug seems to be skipping the routes.rb and model definitions)? 

class ApplicationController < ApplicationController

    before_action :setup_some_variable
    ..........
end

The purpose of setup_some_variable is to set variables which will be used in routes.rb and models in the engine.

Or an engines's routes.rb and models are loaded when the main_app is launched. Here the main app's `routes.rb' mounting a Rails engine:

Myapp::Application.routes.draw do

  mount MyEngine::Engine => "/my_engine"

end

Upvotes: 1

Views: 1471

Answers (2)

Moon soon
Moon soon

Reputation: 2856

# config/initializers/my_engine_patch.rb

Rails.application.config.to_prepare do
  MyEngine::ApplicationController.class_eval do
    before_action :your_method

    private

    def your_method
      # your code here
    end
  end
end

Upvotes: 1

tpbowden
tpbowden

Reputation: 2090

Routes are loaded on application startup, and models are loaded using the Autoloader so the first time they are referenced in your code.

before_action runs before any controller action is run, so after the request has been routed to the correct controller action.

The Rails booting process is documented here: https://github.com/rails/rails/blob/master/railties/lib/rails/application.rb#L37

Upvotes: 1

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