我在该构成的操作应该被包裹在一个事务一个服务对象的方法。其中的一些操作也被包裹在交易。例如:
类PostCreator DEF创建 的ActiveRecord :: Base.transaction做 post.do_this post.do_that user.do_more(帖子,other_stuff) 结束 结束 结束 高清帖子 高清do_this 交易做; ...;结束 结束 结束
我需要任何嵌套失败冒泡一路顶端,但我不知道如何做到这一点,并在nested交易似乎没有提供一个解决方案。从文档:
#标准嵌套 User.transaction做 User.create(用户名:'小鸟') User.transaction做 User.create(用户名:音梦) 提高的ActiveRecord ::回滚#这不会泡了: #_Both_用户仍会被创建。 结束 结束 在嵌套事务TRUE`:#用`REQUIRES_NEW嵌套 User.transaction做 User.create(用户名:'小鸟') User.transaction(REQUIRES_NEW:真)办 User.create(用户名:音梦) 提高的ActiveRecord ::回滚#这不会泡了两种 #小鸟仍然会被创建。 结束 结束解决方案
下面是如何,你可以得到你的嵌套事务失败冒泡:
User.transaction办 User.create(用户名:'小鸟') 提高的ActiveRecord ::回滚,除非User.transaction(REQUIRES_NEW:真)办 User.create(用户名:音梦) 提高的ActiveRecord ::回滚 结束 结束
基本上,你必须产生一个错误在你的顶级事务为它回滚了。要做到这一点,你提出一个错误,如果嵌套事务返回falsey值(无)或truthy值。
希望帮助!
I have a method in a service object that composes operations that should be wrapped in a transaction. Some of these operations are also wrapped in transactions. For example:
class PostCreator def create ActiveRecord::Base.transaction do post.do_this post.do_that user.do_more(post, other_stuff) end end end def Post def do_this transaction do; ...; end end endI need any nested failures to bubble up all the way to the top, but I'm not sure how to make that happen, and the ActiveRecord docs on nested transactions don't seem to offer a solution. From the docs:
# Standard nesting User.transaction do User.create(username: 'Kotori') User.transaction do User.create(username: 'Nemu') raise ActiveRecord::Rollback # This won't bubble up: # _Both_ users will still be created. end end # Nesting with `requires_new: true` on the nested transaction User.transaction do User.create(username: 'Kotori') User.transaction(requires_new: true) do User.create(username: 'Nemu') raise ActiveRecord::Rollback # This won't bubble up either # "Kotori" will still be created. end end解决方案
Here's how you could get failures in your nested transactions to bubble up:
User.transaction do User.create(username: 'Kotori') raise ActiveRecord::Rollback unless User.transaction(requires_new: true) do User.create(username: 'Nemu') raise ActiveRecord::Rollback end endBasically, you have to raise an error in your top-level transaction for it to rollback too. To do that, you raise an error if the nested transaction returns a falsey value(nil) or a truthy value.
Hope that helps!
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