Rails,销毁与删除？

Question

为什么这样做:

@poll_votes = PollVote.where(:user_id => self.user_id, :poll_id => self.poll_id).all

@poll_votes.each do |p|
  p.destroy
end

但这不是吗？

@poll_votes = PollVote.where(:user_id => self.user_id, :poll_id => self.poll_id).destroy

Answer 1

where方法返回符合选择条件的可枚举的activerecord对象集合.在该集合上调用destroy方法与在单个activerecord对象上调用destroy方法不同.

Answer 2

这应该工作:PollVote.destroy_all(:user_id => self.user_id,:poll_id => self.poll_id)