开始..救援......救援..确保只是出错？

Question

快速提问，开始，救援，确保。以下面的代码为例：

begin
  user = User.new

  # Do stuff with User

  user.save if user.valid?

  # Do other stuff here...

  # ## Error happens here after user has already been saved. ##

  render text: "Success", status: :ok
rescue MyExceptions::MySpecialError => e
  # Do something special here for an error
  # Output errors the user has power to fix themselves
  render text: "You messed up!", status: :bad_request
rescue => e
  # Do something special here for an error the user can't fix
  render text: "Internal Error! See support!", status: :unprocessed_entity
ensure
  # If user was created, destroy them
  user.destroy
end

无论是否发生错误，都要确保运行。有没有办法只在发生错误时才运行user.destroy（或确保）？

提前致谢！

Answer 1

ensure中的代码无论是否存在错误都将被执行，这实际上是使用它的好处。

在您的具体情况下，您可以在user.destroy内移动rescue，只有在发生错误时才会运行。