migrationでforeign keyを定義する - Pistolfly

UsingMigrations in Ruby on Rails class CreateLineItems < ActiveRecord::Migration def self.up create_table(:line_items) do |t| t.column(:product_id, :integer, :null => false) t.column(:quantity, :integer, :null => false, :default => 0) end # This line is required if you're running a version of MySQL prior to 4.1.2 #add_index(:line_items, [:product_id], :name => 'fk_line_items_product') execute('ALT