Class PartialArticleForm

tests/model_forms/tests.py:1813–1816

        # have a value of None. If a field isn't specified on a form, the
        # object created from the form can't provide a value for that field!
        class PartialArticleForm(forms.ModelForm):
            class Meta:
                model = Article
                fields = ("headline", "pub_date")

        f = PartialArticleForm(auto_id=False)
        self.assertHTMLEqual(