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.

Answer 2

I think this should work

module Qwerty
  module Core
    module Extensions
      module User
      # Instance Methods Go Here 

        # Class Methods
        module ClassMethods
          def relate
            has_many  :hits, :uniq => true # no method found

            before_validation_on_create :generate_code # no method found
          end

          def something # works!
            "something"
          end
        end

        def self.included(base)
          base.extend(ClassMethods).relate
        end
      end
    end
  end
end

The old code is wrong cause the validation and the association are called upon module loading, and this module knows nothing about ActiveRecord. That's a general aspect of Ruby, code inside class or module bodies is called directly when loaded. You don't want that. To get around that you can use the above solution.

Answer 3

You should be able to do this. A little more concise IMHO.

module Qwerty::Core::Extensions::User
  def self.included(base)
    base.class_eval do
      has_many  :hits, :uniq => true
      before_validation_on_create :generate_code
    end
  end
end