Form inheritance (docs) in Django is extremely straightforward:
| class EnhancedModelForm(ModelForm): | |
| … | |
| class SuperEnhancedModelForm(EnhancedModelForm): | |
| … |
You can also subclass the parent’s Meta inner class if you want to change the Meta.fields or Meta.excludes lists:
| class EnhancedModelForm(ModelForm): | |
| class Meta: | |
| model = MyModel | |
| fields = ('field1', 'field2') | |
| class SuperEnhancedModelForm(EnhancedModelForm): | |
| class Meta(EnhancedModelForm.Meta): | |
| model = MyModel | |
| fields = ('field3', 'field4') |
But what if you want to add to the fields rather than replace them? This is actually straightforward as well:
| class EnhancedModelForm(ModelForm): | |
| class Meta: | |
| model = MyModel | |
| fields = ('field1', 'field2') | |
| class SuperEnhancedModelForm(EnhancedModelForm): | |
| class Meta(EnhancedModelForm.Meta): | |
| model = MyModel | |
| fields = EnhancedModelForm.Meta.fields + ('field3', 'field4') |
