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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