Fixed #8299 -- Clarified the ModelAdmin.form option. Also added an inner Meta...

``form``

~~~~~~~~

The default ``forms.ModelForm`` class used to generate the form on the

add/change pages for models. You can easily change this to your own

``ModelForm`` to override the default form behavior of the add/change pages.

By default a ``ModelForm`` is dynamically created for your model. It is used

to create the form presented on both the add/change pages. You can easily

provide your own ``ModelForm`` to override any default form behavior on the

add/change pages.

For an example see the section `Adding custom validation to the admin`_.

.. _Adding custom validation to the admin: #adding-custom-validation-to-the-admin

``fieldsets``

~~~~~~~~~~~~~

any field::

    class MyArticleAdminForm(forms.ModelForm):

        class Meta:

            model = Article

        def clean_name(self):

            # do something that validates your data

            return self.cleaned_data["name"]