validates_presence_of in a module

Question

i have a model. i want import in this model a module. in this module i want insert a validates_presence_of for the models that import it

I want know if and how is possible to do something like this:

class Ele < ActiveRecord::Base
  include Mod
end

module Mod
   validates_presence_of     :field
end

Thanks

Answer 1

You can use the self.included hook.

class Ele < ActiveRecord::Base
  include Mod
end

module Mod
  def self.included(base)
    base.class_eval do
      validates_presence_of :field
    end
  end
end