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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