Fixed #25241 -- Corrected ModelForm.save() error message when saving invalid...

        If commit=True, then the changes to ``instance`` will be saved to the

        database. Returns ``instance``.

        """

        if self.instance.pk is None:

        if self.instance._state.adding:

            fail_message = 'created'

        else:

            fail_message = 'changed'

import datetime

import os

import tempfile

import uuid

from django.core import validators

from django.core.exceptions import ValidationError

    def save(self, force_insert=False, force_update=False):

        super(Photo, self).save(force_insert, force_update)

        self._savecount += 1

class UUIDPK(models.Model):

    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

    name = models.CharField(max_length=30)

from __future__ import unicode_literals

from django import forms

from django.test import TestCase

from .models import UUIDPK

class UUIDPKForm(forms.ModelForm):

    class Meta:

        model = UUIDPK

        fields = '__all__'

class ModelFormBaseTest(TestCase):

    def test_create_save_error(self):

        form = UUIDPKForm({})

        self.assertFalse(form.is_valid())

        msg = "The UUIDPK could not be created because the data didn't validate."

        with self.assertRaisesMessage(ValueError, msg):

            form.save()

    def test_update_save_error(self):

        obj = UUIDPK.objects.create(name='foo')

        form = UUIDPKForm({}, instance=obj)

        self.assertFalse(form.is_valid())

        msg = "The UUIDPK could not be changed because the data didn't validate."

        with self.assertRaisesMessage(ValueError, msg):

            form.save()

        form = FPForm()

        names = [p[1] for p in form['path'].field.choices]

        names.sort()

        self.assertEqual(names, ['---------', '__init__.py', 'models.py', 'tests.py'])

        self.assertEqual(names, ['---------', '__init__.py', 'models.py', 'test_uuid.py', 'tests.py'])

    @skipUnless(test_images, "Pillow not installed")

    def test_image_field(self):