On Mar 10, 12:54 pm, Dmitry Teslenko <dtesle...@gmail.com> wrote:
> Hello!
>
> I'm starting with django framework; I use django 1.0 and sqlite
> database backend.
> I've stumbled upon this thing: when editing model entry with ModelForm
> I get insert instead of update.
>
> Here's view procedure:
> =========================================================================== ==
> def edit(request, task_id):
> if request.method == 'POST':
> if task_id == -1:
> form = NewTaskForm(data=request.POST, instance=None)
> if form.is_valid():
> form.save()
> else:
> try:
> task = Task.objects.get(pk=task_id)
> form = NewTaskForm(data=request.POST,
> instance=task)
> if form.is_valid():
> form.save()
> except Task.DoesNotExist:
> raise Http404
> return HttpResponseRedirect(get_test_app_url())
> else:
> if task_id == -1:
> form = NewTaskForm()
> else:
> try:
> task = Task.objects.get(pk=task_id)
> form = NewTaskForm(instance=task)
> except Task.DoesNotExist:
> raise Http404
> return render_to_response('test_app/edit.html', { 'form' :
> form })
> =========================================================================== ==
>
> test_app/edit.html looks like this:
> =========================================================================== ==
> <form action="/py/test_app/edit/" method="POST">
> {{ form.as_p }}
> <input type="submit" value="Save" />
> </form>
> =========================================================================== ==
>
> I guess I miss some obvious thing. Please help to spot it.
How is the view getting the task_id parameter? Your form is always
posting to edit/, with no parameter, so there's no way it can pass the
task_id to the view. Presumably your URLconf has a default to -1, and
there's no way to get anything else, which is why the form always
inserts.
--
DR.
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