db/migrate/20130222074652_create_group_memberships.rb


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class CreateGroupMemberships < ActiveRecord::Migration
  def self.up
    create_table :group_memberships do |t|
      t.integer :group_id
      t.string :item_type
      t.integer :item_id
      t.timestamps
    end
  end

  def self.down
    drop_table :group_memberships
  end
end