Django Form with a one-to-many relationship
Sounds like you want an inline model form. This give you the ability to add/remove Car objects from a Person within the Person form.
That previous link was for inlinemodeladmin. This next link is for an inline form: https://docs.djangoproject.com/en/dev/topics/forms/modelforms/#modelforms-factory
I didn't have any chance with inline formset, so i would suggest to override your save method of the model, i feel it's more DRY:
class PersonForm(forms.ModelForm):
# add a field to select a car
car = forms.ModelChoiceField(car.objects.all())
class Meta:
model = Person
fields = ('description', 'car')
def save(self, commit=True):
instance = super().save(commit)
# set Car reverse foreign key from the Person model
instance.car_set.add(self.cleaned_data['car']))
return instance
I know this is an old thread, but since I found myself almost exclusively pointed here by google when searching, I thought I would include the following for anyone else looking for an answer.
The answer, I think, is to use
https://docs.djangoproject.com/en/3.1/ref/forms/fields/#modelchoicefield
or
https://docs.djangoproject.com/en/3.1/ref/forms/fields/#modelmultiplechoicefield
There is a good article on how to use the modelmultiplechoicefield at :
https://medium.com/swlh/django-forms-for-many-to-many-fields-d977dec4b024
But it works for one to many fields as well. These allow us to generate a form with multiple choices as checkboxes or similar widgets based upon a related field in a model.