On Wed, Feb 3, 2010 at 9:44 PM, <kelvan.mailingl...@gmail.com> wrote:
> I have a similar problem. In my database is a result class.
> You need an exam, a user and the points to create a result and points are
> without null-values.
> Now I want to use Result.objects.get_or_create(exam=e,user=u) to get the
> result if there already is one or create a new one.
> This won't work because get_or_create tries to save the object to db and
> fails.
> I want to get_or_create a result and change the points without manual
> validating if it already exists.
>
> The postcondition have to be "result object with given exam, user and points
> saved in database, only one result per user/exam combination"
> r, c = Exam_result.objects.get_or_create( user = u, exam = e )
> r.points = p
> r.save()
>
> Result(exam = e, user = u) generates a new object i think, if I save this I
> have two results for one person at one exam, that's not what I want.
>
> Sorry if I'm completly wrong with this, would be nice if somebody is able to
> enlighten me.
>
> -- Florian
>
>
Er,
r, c = Exam_result.objects.get_or_create(user=u, exam=e,
defaults={'points': p, })
if not c:
r.points = p
r.save()
See http://www.djangoproject.com/documentation/models/get_or_create/
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