保存失败后Rails没有回滚事务（）(Rails not rolling back transaction after failed save())

 我有这个域模型：用户有一组项目，项目的状态可能无法通过验证。 
 
 验证工作正常，我甚至看到当我使用save!时调用异常save! 。 
 
 在我的控制器中，我有这个： 
 
@user.items() << item

if @user.save
  render :json => {}, :status => :ok
else
  render :json => {:status => :error, :errors => item.errors}, :status => :bad_request
end
 
 第一个POST成功，第二个POST失败，但是当我点击索引时，我仍然看到两个对象，好像第二个事务从未回滚过。 到底是怎么回事？ 
 
 我的测试是这样的： 
 
  post :create
  post :create
  get :index
  ActiveSupport::JSON.decode(response.body).length.should == 1
 
 编辑：即使在运行服务器时，也不会回滚事务（sqlite3）。 

I have this domain model: A user has group of items, and the state of the items can fail a validation.
 
Validation works fine, and I even see exceptions get called when I use save!.
 
In my controller, I have this:
 
@user.items() << item

if @user.save
  render :json => {}, :status => :ok
else
  render :json => {:status => :error, :errors => item.errors}, :status => :bad_request
end
 
The first POST succeeds, and the second POST fails, but when I hit the index, I still see two objects, as if the second transaction never rolled back. What is going on?
 
My test is this:
 
  post :create
  post :create
  get :index
  ActiveSupport::JSON.decode(response.body).length.should == 1
 
Edit: Even when running a server, transactions are not being rolled back (sqlite3).

原文：https://stackoverflow.com/questions/14665269