djangoinline-formsetdjango-class-based-views

django class-based views with inline model-form or formset


I have the following models:

class Bill(models.Model):
    date = models.DateTimeField(_("Date of bill"),null=True,blank=True)

class Item(models.Model):
    name = models.CharField(_("Name"),max_length=100)
    price = models.FloatField(_("Price"))
    quantity = models.IntegerField(_("Quantity"))
    bill = models.ForeignKey("Bill",verbose_name=_("Bill"),
                             related_name="billitem")

I know that this is possible:

from django.forms.models import inlineformset_factory
inlineformset_factory(Bill, Item)

and then process this via standard view.

Now I was wondering, if there is a way to achieve the same (meaning: using a inline for adding/editing items belonging to a bill) using class based views (not for the admin-interface).


Solution

  • Key points is:

    1. generated FormSets within forms.py using inlineformset_factory:

      BookImageFormSet = inlineformset_factory(BookForm, BookImage, extra=2)
      BookPageFormSet = inlineformset_factory(BookForm, BookPage, extra=5)
      
    2. returned the FormSets within a CreateView class in views.py:

      def get_context_data(self, **kwargs):
          context = super(BookCreateView, self).get_context_data(**kwargs)
          if self.request.POST:
              context['bookimage_form'] = BookImageFormSet(self.request.POST)
              context['bookpage_form'] = BookPageFormSet(self.request.POST)
          else:
              context['bookimage_form'] = BookImageFormSet()
              context['bookpage_form'] = BookPageFormSet()
          return context
      
    3. Used form_valid to save the form and formset:

       def form_valid(self, form):
           context = self.get_context_data()
           bookimage_form = context['bookimage_formset']
           bookpage_form = context['bookpage_formset']
           if bookimage_form.is_valid() and bookpage_form.is_valid():
               self.object = form.save()
               bookimage_form.instance = self.object
               bookimage_form.save()
               bookpage_form.instance = self.object
               bookpage_form.save()
               return HttpResponseRedirect('thanks/')
           else:
               return self.render_to_response(self.get_context_data(form=form))