Polymorphic Association Example

gistfile1.rb

### PaymentWay
class PaymentWay < ActiveRecord::Base
  belongs_to :payable, :polymorphic => true
end

class CreatePaymentWays < ActiveRecord::Migration
  def change
    create_table :payment_ways do |t|
      t.string  :name
      t.references :payable, :polymorphic => true # Will create two columns => :payable_id and :payable_type

      t.timestamps
    end
  end
end

### CreditCard
class CreditCard < ActiveRecord::Base
  has_many :payment_ways, :as => :payable
  belongs_to :company
  belongs_to :flag
end

class CreateCreditCards < ActiveRecord::Migration
  def change
    create_table :credit_cards do |t|
      t.string     :name,       :null => false
      t.references :company,    :null => false
      t.references :flag,       :null => false

      t.timestamps
    end
  end
end

need full project of this association