Extend model in plugin with “has_many” using a module

Question

I have a some code in an engine style plugin which includes some models. In my app I want to extend one of these models. I have managed to add both instance and class methods to

Answer 1

In Rails 3, this sounds like a good use case for ActiveSupport::Concern:

module Qwerty::Core::Extensions::User

  extend ActiveSupport::Concern

  included do
    has_many  :hits, :uniq => true
    before_validation_on_create :generate_code 
  end
end

class User
  include Querty::Core::Extensions::User
  # ...
end

Here are the ActiveSupport::Concern docs and the most helpful blog article on it I've found.