ModelForm with OneToOneField in Django

Question

I have two models in Django that are related with a OneToOneField (PrinterProfile and PrinterAdress). I am trying to do a form with PrinterProfileForm, but for some reason it does NOT pass the PrinterAddress fields into the form (it's not rendered by Django "magic" in the template).

What should I do so that my PrinterProfileForm include as well the fields from PrinterAddress (its related OneToOneField)?

Thanks a lot

class PrinterProfile(TimeStampedModel):     user = models.OneToOneField(User)     phone_number = models.CharField(max_length=120, null=False, blank=False)     additional_notes = models.TextField()     delivery = models.BooleanField(default=False)     pickup = models.BooleanField(default=True)   # The main address of the profile, it will be where are located all the printers.     class PrinterAddress(TimeStampedModel):     printer_profile = models.OneToOneField(PrinterProfile)     formatted_address = models.CharField(max_length=200, null=True)     latitude = models.DecimalField(max_digits=25, decimal_places=20)  # NEED TO CHECK HERE THE PRECISION NEEDED.     longitude = models.DecimalField(max_digits=25, decimal_places=20)  # NEED TO CHECK HERE THE PRECISION NEEDED.     point = models.PointField(srid=4326)      def __unicode__(self, ):         return self.user.username  class PrinterProfileForm(forms.ModelForm):     class Meta:         model = PrinterProfile         exclude = ['user'] 

Answer 1

You have to create second form for PrinterAddress and handle both forms in you view:

if all((profile_form.is_valid(), address_form.is_valid())):     profile = profile_form.save()     address = address_form.save(commit=False)     address.printer_profile = profile     address.save() 

Of course in the template you need to show both forms under one <form> tag :-)

<form action="" method="post">     {% csrf_token %}     {{ profile_form }}     {{ address_form }} </form> 

Answer 2

Complementing the accepted answer:

If you have custom clean methods, you need to add a try/except case. For the example presented if address had a clean() method to validate something you needed to change it to:

def clean(self):     try:         printer_profile = self.printer_profile      except ObjectDoesNotExist:         pass     else:         ...code to validate address...