gist: 73916


  
    
      model-mixin-example.rb #
    
    
      
      
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              module Sold
 
  def self.included(base)
    base.extend ClassMethods
    base.instance_eval do 
      belongs_to :seller, :polymorphic => true
      include InstanceMethods
    end
  end
  
  module ClassMethods
    # seller-related class methods
  end
  
  module InstanceMethods
    # seller-related instance methods
  end
 
end
 
TheModel.send(:include, Sold)
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