# encoding:utf-8 class CreateProductRelateds < ActiveRecord::Migration def up create_table :depart_records_products do |t| t.integer :product_id t.integer :depart_record_id end add_index :depart_records_products, [:product_id, :depart_record_id], :name => "idx_product_id" end def down drop_table :depart_records_products end end