如何删除 ActiveRecord 对象? [英] How do you delete an ActiveRecord object?
问题描述
如何删除 ActiveRecord 对象?
How do you delete an ActiveRecord object?
我查看了 Active Record Querying 并且它没有任何我可以看到的删除内容.
I looked at Active Record Querying and it does not have anything on deleting that I can see.
通过
id、
删除当前对象，如:user.remove,
你能根据 where 子句删除吗?
Can you delete based on a where clause?
推荐答案
是 destroy 和 destroy_all 方法，比如
It's destroy and destroy_all methods, like
user.destroy
User.find(15).destroy
User.destroy(15)
User.where(age: 20).destroy_all
User.destroy_all(age: 20)
或者，您可以使用 delete 和 delete_all，它们不会强制执行 :before_destroy 和 :after_destroy 回调或任何依赖关联选项.
Alternatively you can use delete and delete_all which won't enforce :before_destroy and :after_destroy callbacks or any dependent association options.
User.delete_all(condition: 'value') 将允许您删除记录没有主键
User.delete_all(condition: 'value')will allow you to delete records without a primary key
注意:根据@hammady 的评论，如果 User 模型没有主键，user.destroy 将不起作用.
Note: from @hammady's comment, user.destroy won't work if User model has no primary key.
注意 2:根据@pavel-chuchuva 的评论，带有条件的 destroy_all 和带有条件的 delete_all 在 Rails 5.1 中已被弃用 - 请参阅指南.rubyonrails.org/5_1_release_notes.html
Note 2: From @pavel-chuchuva's comment, destroy_all with conditions and delete_all with conditions has been deprecated in Rails 5.1 - see guides.rubyonrails.org/5_1_release_notes.html
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