我正在使用django-piston编写RESTful Web服务并遇到问题。
在models.py中:
class Status(models.Model):
user = models.ForeignKey(User)
content = models.TextField(max_length=140)
class StatusReply(models.Model):
user = models.ForeignKey(User)
reply_to = models.ForeignKey(Status, related_name='replies')
content = models.TextField(max_length=140)
has_read = models.BooleanField(default=False, help_text="has the publisher of the status read the reply")
在handlers.py中:
class StatusHandler(BaseHandler):
allowed_methods = ('GET', 'POST', 'DELETE' )
model = Status
fields = ('id',
('user', ('id', 'username', 'name')),
'content',
('replies', ('id',
('user', ('id', 'username', 'name')),
'content',
'has_read'),
),
)
@need_login
def read(self, request, id, current_user): # the current_user arg is an instance of user created in @need_login
try:
status = Status.objects.get(pk=id)
except ObjectDoesNotExist:
return rc.NOT_FOUND
else:
if status.user == current_user: #if current_user is the publisher of the status, set all replies read
status.replies.all().update(has_read=True)
return status
在处理程序中,它通过id返回特定状态。现在我想在status.replies.all().update(has_read=True)
之前返回状态,但也要在数据库中执行更新操作。怎么做?提前谢谢。
答案 0 :(得分:2)
不确定我是否理解您的需求。据我了解您的代码,status.replies.all().update(has_read=True)
不会更改status
,只会更改回复。如果这是真的,代码应该做你想要的。如果不是,您可以复制status
并返回副本:
if status.user == current_user:
old_status = status.make_copy()
status.replies.all().update(has_read=True)
return old_status
return status
或者您只是希望方法尽早返回并异步进行数据库更新?那么你应该看看celery和this nice explanation。