Fixed #19445 -- Skip admin fieldsets validation when the ModelAdmin.get_form()...

from django.contrib.admin import ListFilter, FieldListFilter

from django.contrib.admin.util import get_fields_from_path, NotRelationField

from django.contrib.admin.options import (flatten_fieldsets, BaseModelAdmin,

    HORIZONTAL, VERTICAL)

    ModelAdmin, HORIZONTAL, VERTICAL)

__all__ = ['validate']

            raise ImproperlyConfigured("'%s.%s' refers to field '%s' that "

                "is missing from the form." % (cls.__name__, label, field))

    else:

        get_form_is_overridden = hasattr(cls, 'get_form') and cls.get_form != ModelAdmin.get_form

        if not get_form_is_overridden:

            fields = fields_for_model(model)

            try:

                fields[field]

    changelist that will be linked to the change view, as described in the

    :attr:`ModelAdmin.list_display_links` section.

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

    The ``get_fieldsets`` method is given the ``HttpRequest`` and the ``obj``

    being edited (or ``None`` on an add form) and is expected to return a list

    of two-tuples, in which each two-tuple represents a ``<fieldset>`` on the

    admin form page, as described above in the :attr:`ModelAdmin.fieldsets` section.

.. method:: ModelAdmin.get_list_filter(self, request)

    .. versionadded:: 1.5

    form = SongForm

    fields = ['spam']

class ValidFormFieldsets(admin.ModelAdmin):

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

        class ExtraFieldForm(SongForm):

            name = forms.CharField(max_length=50)

        return ExtraFieldForm

    fieldsets = (

        (None, {

            'fields': ('name',),

        }),

    )

class ValidationTestCase(TestCase):

    def test_readonly_and_editable(self):

            validate,

            InvalidFields, Song)

    def test_custom_get_form_with_fieldsets(self):

        """

        Ensure that the fieldsets validation is skipped when the ModelAdmin.get_form() method

        is overridden.

        Refs #19445.

        """

        validate(ValidFormFieldsets, Song)

    def test_exclude_values(self):

        """

        Tests for basic validation of 'exclude' option values (#12689)