What are modelform_factory() and modelformset_factory()? (Django)

Question

What are Django modelform_factory() and modelformset_factory(), and how do they correlate to the Django models, forms and modelforms?

Answer 1

• forms.Form can be used to explicitly define a form, specifying each of the form fields.
• When working with a model, forms.ModelForm can be used, which is built on top of Form. ModelForm handles automatic declaration of form fields, some validations, and saving an instance.
• modelform_factory() generates a ModelForm -- think of it as a kind of shortcut to define a default ModelForm for your model.
• Similarly, modelformset_factory() generates a ModelFormSet, used with one-to-many relations.

Examples where you can find automatically-generated forms or formsets include the Django admin and Generic Class Views.

Official Django documentation:

• https://docs.djangoproject.com/en/5.0/ref/forms/models/ -- modelform_factory(), modelformset_factory()
• https://docs.djangoproject.com/en/5.0/topics/forms/modelforms/ -- ModelForm()