Fixed #23455 -- Accept either bytes or text for related_name, convert to text.

from django.db.models.related import RelatedObject, PathInfo

from django.db.models.query import QuerySet

from django.db.models.expressions import Col

from django.utils.encoding import smart_text

from django.utils.encoding import force_text, smart_text

from django.utils import six

from django.utils.translation import ugettext_lazy as _

from django.utils.functional import curry, cached_property

            sup.contribute_to_class(cls, name, virtual_only=virtual_only)

        if not cls._meta.abstract and self.rel.related_name:

            related_name = self.rel.related_name % {

            related_name = force_text(self.rel.related_name) % {

                'class': cls.__name__.lower(),

                'app_label': cls._meta.app_label.lower()

            }

* Fixed a crash in the admin when using "Save as new" and also deleting a

  related inline (:ticket:`23857`).

* Removed auto-conversion of ``related_name`` to unicode in field

  deconstruction, to maintain consistency of bytes/text in migrations matching

  the original values (:ticket:`23455` and :ticket:`23982`).

* Always converted ``related_name`` to text (unicode), since that is required

  on Python 3 for interpolation. Removed conversion of ``related_name`` to text

  in migration deconstruction (:ticket:`23455` and :ticket:`23982`).

class Bar(models.Model):

    b = models.CharField(max_length=10)

    a = models.ForeignKey(Foo, default=get_foo)

    a = models.ForeignKey(Foo, default=get_foo, related_name=b'bars')

class Whiz(models.Model):

        warnings = checks.run_checks()

        self.assertEqual(warnings, expected_warnings)

    def test_related_name_converted_to_text(self):

        rel_name = Bar._meta.get_field_by_name('a')[0].rel.related_name

        self.assertIsInstance(rel_name, six.text_type)

class DateTimeFieldTests(unittest.TestCase):

    def test_datetimefield_to_python_usecs(self):