关于rails model的关系维护

Question

我现在有两个model，House和Company是多对一的关系，那么我想在删除Company的时候，如果有House引用就不能删除，否则可以直接删除Conmpany，这种关系需要怎么配置呢？

Answer 1

试试这样写行不

 has_many :houses, dependent: :restrict

http://apidock.com/rails/ActiveRecord/Associations/ClassMethods/has_many

:restrict this object raises an ActiveRecord::DeleteRestrictionError exception and cannot be deleted if it has any associated objects.