使用ActiveRecord冒泡嵌套事务失败

我在服务对象中有一个方法,它组成应该包含在事务中的操作.其中一些操作也包含在事务中.例如:

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
 end

我需要任何嵌套的失败一直到顶部,但我不确定如何实现这一点,嵌套事务上的ActiveRecord文档似乎没有提供解决方案.来自文档:

# 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

Gjaldon.. 31

以下是您在嵌套事务中出现故障的方法:

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
end

基本上,您必须在顶级事务中引发错误以使其回滚.为此,如果嵌套事务返回falsey值(nil)或truthy值,则会引发错误.

希望有所帮助!