I have a view where the user should be able to update an instance of a model, and also update or create new instances of a model related to the first one. I tryied using formsets to do this, and it works perfeclty for creating new objects, but i'm not finding a way to show the objects that already have been created. My problem is that i don't know how to populate the formsets with the existing data, so that i can put it in the context
So this are my models:
class Order(Model):
...
class invoice(Model):
order = models.ForeignKey(Order)
...
And my view is something like this:
class OrderDetailView(UpdateView):
invoice_form_class = InvoiceForm
def get_context_data(self, **kwargs):
context = super(OrderDetailView, self).get_context_data(**kwargs)
if not 'invoice_formset' in context:
context['invoice_formset'] = formset_factory(self.invoice_form_class, extra=3, can_delete=True, formset=BaseFormSet)
return context
There's probably an easy way to do this, but i'm not finding it anywhere
EDIT: Thanks to @mariodev, i've learned about the inline_formsetfactory, and i'm using it. Now i can fill the formsets with the existing data, and i can create and alter existing ones, but when i try to delete them, nothing happens.
So now i'm defining this formset:
InvoiceFormset = inlineformset_factory(Order, Invoice, fields=('code',), can_delete=True, extra=0)
and my view looks like:
class OrderDetailView(UpdateView):
invoice_form_class = InvoiceForm
def get_context_data(self, **kwargs):
context = super(OrderDetailView, self).get_context_data(**kwargs)
if not 'invoice_formset' in context:
context['invoice_formset'] = InvoiceFormset(instance=self.get_object())
return context
def post(self, *args, **kwargs):
data = self.request.POST
order = self.get_object()
form = self.form_class(data)
invoice_formset = InvoiceFormset(data, instance=order)
if form.is_valid() and invoice_formset.is_valid():
self.object = form.save(order)
for f in invoice_formset:
f.save(self.object)
return HttpResponseRedirect(reverse('order_detail', kwargs={'order_id': self.get_object().order_id}))
I could add some extra lines in the post() to check if i have to delete the form, but it doesn't seem right for me to do it in the view. Is there something else i'm missing?
EDIT AGAIN:
Ended up finding this link which fix exactly this last problem i was having, so now it's all good!
