Re: Modelforms and class based views

[nkryptic]

Multiple forms with generic views are a problem - you can't really use the form processing ones as they expect a single form.  But, say you want a view that has a Pet form and and Owner form

class Owner(models.Model):

    name = models.CharField(max_length=100)

    email = models.CharField(max_length=100)

class Pet(models.Model):

    owner = models.ForeignKey(Owner)

    name = models.CharField(max_length=100)

    breed = models.CharField(max_length=100)

class OwnerForm(forms.ModelForm):

    class Meta:

        model = Owner

class PetForm(forms.ModelForm):

    class Meta:

        model = Pet

        exclude = ('owner',)

class PetAndOwnerRegisterView(TemplateView):

    template_name = 'register.html'

    

    def get(self, request):

        forms_dict = self.get_forms()

        return self.render_to_response(forms_dict)

    

    def post(self, request):

        forms_dict = self.get_forms(request.POST)

        if forms_dict['owner_form'].is_valid() and forms_dict['pet_form'].is_valid():

            forms_dict['owner_form'].save()

            forms_dict['pet_form'].save()

            return HttpResponseRedirect(reverse('success_view'))

        return self.render_to_response(forms_dict)

    

    def get_forms(self, data=None):

        owner = Owner()

        pet = Pet(owner=owner)

        owner_form = OwnerForm(data, instance=owner)

        pet_form = PetForm(data, instance=pet)

        forms_dict = {

            'owner_form': owner_form,

            'pet_form': pet_form,

        }

        return forms_dict

The tricky part is in the get_forms method, with populates the instances for each form.  The Pet model is instantiated with an unsaved Owner model - the same one that is used in the owner form.  That ties them together.

Then, in the post method, you simply need to save the owner_form first - so that a primary key will be populated - and then the pet form can be saved and the pet tied to that owner.

On Friday, January 4, 2013 11:51:41 AM UTC-5, Marco A Morales wrote:

Hi everyone,

I'm still wraping my head around class based views and I'm trying my first project with class based views. I'm having trouble deciding how to write a view that will display a two Modelforms, one having a foreign key over the other. 

I will need to do the .save(commit=False) part to save my first model and then be able to save the model with foreign key.

How would you guys do it? 

[Pedro J. Aramburu]

Have you tried merging the forms with formsets?

https://docs.djangoproject.com/en/1.4/topics/forms/formsets/

[Pedro J. Aramburu]

https://docs.djangoproject.com/en/1.4/topics/forms/modelforms/#model-formsets