20151028123327_constraints.rb
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	class Constraints < ActiveRecord::Migration
	def up
	execute <<-SQL.gsub(/\s+/, ' ').strip
	ALTER TABLE `records` ADD CONSTRAINT `records_ibfk_1` FOREIGN KEY (`domain_id`)
	REFERENCES `domains` (`id`) ON DELETE CASCADE;
	SQL
	end

	def down
	execute 'ALTER TABLE `records` DROP FOREIGN KEY `records_ibfk_1`'
	end
	end