Django 查询集求值序列。意外覆盖的新活动位
在将新值保存到db中的某个db模型字段后，我试图显示该字段的旧值（Django 查询集求值序列。意外覆盖的新活动位,django,Django,在将新值保存到db中的某个db模型字段后，我试图显示该字段的旧值（RelatedModel.new\u reply）。这应该是一种工作方式，new\u reply字段将回复（通过将其设置为1）标记为收件人未读（rto）。收件人查看邮件后，new\u reply将重置为0。如果收件人有尚未单击查看的新回复，则模板my_view.html会向收件人显示一个标志。收件人第一次查看回复时，会重置标志new\u reply，后续视图不会标记为new 问题在于，response.save（）行似乎除了数据库
RelatedModel.new\u replynew\u replyrtonew\u replynew\u replyresponse.save（）dnew\u replynew_reply==1new_reply==0dclass ParentModel (models.Model):
msg = models.TextField()
author = models.ForeignKey(User)
class RelatedModel (models.Model):
msg = models.ForeignKey(ParentModel)
reply = models.TextField()
rto = models.ForeignKey(User, related_name='rto')
new_reply = models.IntegerField(null=True, blank=True)
def view_msg(request, msg_id):
m = get_object_or_404(ParentModel, pk=id)
r = m.RelatedModel_set.all()
d = add_csrf(request, m=m, r=r) # d.r.new_reply==1 should be rendered
# Once the view data is ready for rendering, clear the new_reply
# bit. If we do it earlier, we will not be able to mark replies as new.
if request.user.is_authenticated():
for response in r:
# Clear bit if current user is viewing reply addressed to them
if (request.user == RelatedModel.rto):
if response.new_reply == 1: # Is it a new reply?
response.new_reply = 0 # Reset the new_activity bits
response.save()
return render_to_response('my_view.html',
{'db_data': d},
context_instance = RequestContext(request),
)
我认为这个问题可以归结为何时评估查询集。我将
if response.new_reply==1if response.new\u reply==1