osem-fcy/db/migrate/20130216120112_create_registrations_social_events_table.rb

class CreateRegistrationsSocialEventsTable < ActiveRecord::Migration
  def up
    create_table :registrations_social_events, id: false do |t|
      t.references :registration, :social_event
    end
  end

  def down
    drop_table :registrations_social_events
  end
end