Question

我有一个AJAX处理过的视图，它接收几条信息，其中两条是unicode datetime值。

但是，当我尝试直接从对象访问日期时间值（开始/结束）时，它似乎仍然是unicode。

我以为保存转换为datetime？

lid = int(postdata['lid'])
location = Group.objects.get(id=lid)
pgid = int(postdata['pgid'])
program = Group.objects.get(id=pgid)
start = postdata['start']
end = postdata['end']
eid = int(postdata['eid'])
creator = Employee.objects.get(id=eid)
description = postdata['description']

shift = ReliefShift()
shift.start = start
shift.end = end
shift.creator = creator
shift.description = description
shift.location = location
shift.program = program
shift.save()

alertModule = 'Relief Shifts Available'
alertMessage = 'A new relief shift has been posted for {0} from {1} to {2}. Visit the <a href="/staff/program/open-relief-shifts/">Relief Shifts page</a> for more details and to sign up.'.format(shift.location, shift.start.strftime('%b %d @ %I:%M%p'), shift.end.strftime('%b %d @ %I:%M%p'))

Answer 1

调用shift.save()会将日期时间保存到数据库，但不会更新shift。保存后，您可以通过调用refresh_from_db

从数据库重新加载shift对象

shift.start = <unicode string>
shift.save()
# At this point, shift.start will still be a string
shift.refresh_from_db()

# refresh_from_db is new in Django 1.8. In early versions you would do:
shift = Shift.objects.get(pk=shift.pk)

直接从帖子数据中读取值并不是一种好习惯。最好使用form或model form。 Django将负责将值转换为datetime对象，如果您使用的是模型表单，则可以从form.cleaned_data或实例访问日期时间。

发出访问日期时间值（Unicode对象没有属性＆＃39; strftime＆＃39;）

1 个答案: