python – Django – 使用事务原子进行回滚保存

我正在尝试创建一个保存对象的视图,但是如果引发一些异常,我想撤消该保存.这是我试过的：

class MyView(View):

    @transation.atomic
    def post(self, request, *args, **kwargs):
        try:
            some_object = SomeModel(...)
            some_object.save()

            if something:
                raise exception.NotAcceptable()
                # When the workflow comes into this condition, I think the previous save should be undome
                # Whant am I missing?

        except exception.NotAcceptable, e:
            # do something

我究竟做错了什么？即使引发异常,some_object仍然在DataBase中.

解决方法:

Atomicity Documentation

总而言之,如果您的视图产生没有错误的响应,@ transaction.atomic将在数据库上执行事务.因为你自己正在捕获异常,所以Django认为你的视图执行得很好.

如果您发现异常,则需要自己处理：Controlling Transactions

如果您在发生故障时需要生成正确的json响应：

from django.db import SomeError, transaction

def viewfunc(request):
    do_something()

    try:
        with transaction.atomic():
            thing_that_might_fail()
    except SomeError:
        handle_exception()

    render_response()

标签：python,atomicity,django,transactions,django-database
来源： https://codeday.me/bug/20190926/1822071.html