django inline formsets with a complex model for the nested form

Question

Say I have django model that looks something like this:

class Order(models.Model):
 number = models...
 date = models...

class OrderLine(models.Model):
 # O         


        

Answer 1

Some minor changes were needed to make Nathan's code at http://yergler.net/blog/2009/09/27/nested-formsets-with-django/ work in Django 1.3. The line below causes a ManagementForm Error.

TenantFormset = inlineformset_factory(models.Building, models.Tenant, extra=1)

Usings the modelformset_factory and manually defining the queryset seems to work, but I have not implemented the ability to add extras.

TenantFormset = modelformset_factory(models.Tenant, extra=0)

form.nested = [
        TenantFormset(
                        queryset = Tenant.objects.filter(building = pk_value),
                        prefix = 'value_%s' % pk_value
                        )
                    ]

I also had to manually pass data to the sub-sub-forms in the is_valid method:

def is_valid(self):
result = super(BaseProtocolEventFormSet, self).is_valid()

for form in self.forms:
    if hasattr(form, 'nested'):
        for n in form.nested:
            n.data = form.data
            if form.is_bound:
                n.is_bound = True
            for nform in n:
                nform.data = form.data
                if form.is_bound:
                    nform.is_bound = True
            # make sure each nested formset is valid as well
            result = result and n.is_valid()
return result

EDIT:

New instances can be created using jQuery. See this question: