Fixed #17006 - Documented ModelAdmin get_form() and get_formsets()

    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.

    on the add/change pages. Alternatively, you can customize the default

    form rather than specifying an entirely new one by using the

    :meth:`ModelAdmin.get_form` method.

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

.. attribute:: ModelAdmin.inlines

    See :class:`InlineModelAdmin` objects below.

    See :class:`InlineModelAdmin` objects below as well as

    :meth:`ModelAdmin.get_formsets`.

.. attribute:: ModelAdmin.list_display

        (r'^my_view/$', self.admin_site.admin_view(self.my_view, cacheable=True))

.. method:: ModelAdmin.get_form(self, request, obj=None, **kwargs)

    Returns a :class:`~django.forms.ModelForm` class for use in the admin add

    and change views, see :meth:`add_view` and :meth:`change_view`.

    If you wanted to hide a field from non-superusers, for example, you could

    override ``get_form`` as follows::

        class MyModelAdmin(admin.ModelAdmin):

            def get_form(self, request, obj=None, **kwargs):

                self.exclude = []

                if not request.user.is_superuser:

                    self.exclude.append('field_to_hide')

                return super(MyModelAdmin, self).get_form(request, obj, **kwargs)

.. method:: ModelAdmin.get_formsets(self, request, obj=None)

    Yields :class:`InlineModelAdmin`\s for use in admin add and change views.

    For example if you wanted to display a particular inline only in the change

    view, you could override ``get_formsets`` as follows::

        class MyModelAdmin(admin.ModelAdmin):

            inlines = [MyInline, SomeOtherInline]

            def get_formsets(self, request, obj=None):

                for inline in self.get_inline_instances():

                    # hide MyInline in the add view

                    if isinstance(inline, MyInline) and obj is None:

                        continue

                    yield inline.get_formset(request, obj)

.. method:: ModelAdmin.formfield_for_foreignkey(self, db_field, request, **kwargs)

    The ``formfield_for_foreignkey`` method on a ``ModelAdmin`` allows you to

    through to ``inlineformset_factory`` when creating the formset for this

    inline.

    .. _ref-contrib-admin-inline-extra:

.. attribute:: InlineModelAdmin.extra

    This controls the number of extra forms the formset will display in