My model does have multiple fields in it - the Book thing was just an example to simplify. And I do have fields that I need to exclude. Am I not able to exclude fields with the modelformset_factory? You reminded me that I could instead just set extra and use initial if necessary. However, I do need the exclude capability, so that might still be a problem if modelformset_factory does not support that.
I can post some code later when I get things a big more cleaned up. Margie On Mar 3, 8:37 pm, Malcolm Tredinnick <malc...@pointy-stick.com> wrote: > On Tue, 2009-03-03 at 20:21 -0800, Margie wrote: > > I'm using formsets fairly successfully (thanks very much to Malcolm's > > great quiz example), but it seems to me there is some functionality > > missing. Say I create a formset of BookForms, where BookForm is a > > ModelForm. The user will filleout the formset and for each form in > > the formset, when I receive the POST data I will create an instance of > > a Book based on that data. > > > I can't use a modelform_factory because when I create the formset, I > > don't have any book objects yet (which I would need to set the > > queryset for the modelform_factory). > > Can you provide some short code fragments? There's a lot of Modelform > and Modelformsets floating around here and it's not clear whether some > of them are typos or what's going on. > > In particular, it's not clear to me why you can't do > > BookFormset = modelformset_factory(models.Book, extra=5) > > or, if you have a more complex form and also wanted to, say, exclude the > "author" field: > > BookFormset = modelformset_factory(models.Book, > my_forms.BookForm, > extra=5, exclude=["author"]) > > There's nothing in the code behind that which *requires* any books to > exist. > > In fact, you might even want to construct a ModelFormset subclass that > prevents any existing books from being selected as part of that, if you > only want new books to be entered. > > > So instead I use a > > formset_factory that references a BookForm that is derived from a > > ModelForm. However, when I use a formset_factory, I don't have a nice > > way to save the forms in my formset as new book objects. For example, > > when I use just a ModelForm, I can do > > > bookForm = BookForm(postDict) > > newBookObj = bookForm.save() > > > When I use the formset, I can loop through the forms in the formset, > > but then I think I have to create the book objects myself. > > > for form in bookFormSet.forms: > > newBookObj = Book(title=form.cleaned_data['title']) > > Yes, if you're not using anything tied to the model, you'll need to > create them yourself. Since it's only one line of code in this > particular case, it's not really that bad, though, surely. > > But it would be interesting to get some more details about why you > cannot use model formsets directly. > > Regards, > Malcolm --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
