Hmm, yeah, I guess it should... I don't really know much about the
inner workings of ModelForms, but you could try inserting print
statements or something the like directly in the django code for
testing purposes. Or just look at the django code. That almost always
solves the problems I have.
On Tue, Jun 17, 2008 at 8:03 AM, emont88 <[EMAIL PROTECTED]> wrote:
>
> Ok, that makes sense, but I'm still getting weird behavior.
> Right after I call limit_categories() in my view, I inserted the print
> statement: "print form.category.queryset" so that I can see the
> contents of the queryset printed to the console. The result is that
> the console shows the correct thing - only the categories that belong
> to the current blog. However, the form itself still somehow displays
> all of the categories, or the categories that belong to the previous
> user's blog if I just logged out and logged in.
> If form.category.queryset is showing the right thing when printed to
> the console, shouldn't that be exactly what ends up in the html form?
>
> On Jun 17, 1:37 am, "Jonas Oberschweiber" <[EMAIL PROTECTED]>
> wrote:
>> AFAIK querysets are always cached.
>>
>> On Tue, Jun 17, 2008 at 7:06 AM, emont88 <[EMAIL PROTECTED]> wrote:
>>
>> > I'm running into an interesting problem with ModelForms.
>> > I have a blogging app that handles multiple blogs, which makes things
>> > tricky with categories, because each category needs to belong to a
>> > specific blog, so an author editing blog1 should not be allowed to
>> > post an Entry to a Category from blog2. I am using ModelForms to
>> > generate the forms for posting a new Entry, which makes things pretty
>> > straightforward except for the Category foreignkey. I wrote a method
>> > "limit_categories" in my EntryForm class, which I call from the view
>> > after creating the form. This method takes in a Blog object, and
>> > limits the queryset for the Category foreignkey to categories that
>> > belong to that Blog. All seems good at this point.
>> > When I actually access the form though, the behavior is pretty
>> > random. Sometimes, it will not filter the categories at all. Other
>> > times, if I logout and login as another user, it will retain the
>> > category choices from the previous user. After a couple of refreshes
>> > though, it eventually works.
>> > I don't think I have any type of caching enabled, so I'm not sure
>> > what's going on here.
>>
>> > Here is some of my code, hopefully enough to figure things out:
>>
>> > class EntryForm(forms.ModelForm):
>> > class Meta:
>> > model = Entry
>> > fields = ('title', 'slug', 'pub_date', 'category', 'body',
>> > 'excerpt')
>> > # Must define category explicitly so that limit_categories() can
>> > access it
>> > category = forms.ModelChoiceField(queryset=Category.objects.all())
>>
>> > def limit_categories(self, blog):
>> > # Limits the category choices to those belonging to the
>> > current blog
>> > print "Limiting categories"
>>
>> > self.category._set_queryset(Category.objects.filter(blog__exact=blog))
>>
>> > @login_required
>> > def admin_entry_edit(request, entry_id):
>> > entry = get_object_or_404(Entry, id__exact=entry_id)
>> > if request.method == 'POST':
>> > form = EntryForm(request.POST, instance=entry)
>> > if form.is_valid():
>> > form.save()
>> > request.user.message_set.create(message="Entry saved
>> > successfully.")
>> > return HttpResponseRedirect('../')
>> > else:
>> > form = EntryForm(instance=entry)
>> > form.limit_categories(request.user.author_set.all()[0].blog)
>> > context = {'form': form}
>> > return render_to_response('blogs/admin/edit.html', context,
>> > context_instance=RequestContext(request))
> >
>
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