Monkey patch ActiveAdmin class from engine

Question

I have an engine that will be installed over an application that uses Active Admin...

After install Active Admin, I need to run my engine installer. This will create a file monkey patching an Active Admin class.

The file looks like this...

module ActiveAdmin
  module Devise
    # things I need to add...
  end
end

So, the question is: where I need to put this file and why?

Answer 1

I used the Railtie's initializer method.

my_engine/lib/admin_invitable/engine.rb

module MyEngine
  class Engine < ::Rails::Engine
    isolate_namespace MyEngine
    initializer "ativeadmin_invitable_patch" do |app|
      require_relative "activeadmin_invitable_patch"
    end
  end
end

my_engine/lib/admin_invitable/activeadmin_invitable_patch.rb

module ActiveAdmin
  module Devise
    # bla bla
  end
end