Refs #27532 -- Removed Model._meta.has_auto_field per deprecation timeline.

django/db/models/options.py

 import copy
 import inspect
-import warnings
 from bisect import bisect
 from collections import OrderedDict, defaultdict
 
@@ -13,7 +12,6 @@ from django.db.models.fields import AutoField
 from django.db.models.fields.proxy import OrderWrt
 from django.db.models.query_utils import PathInfo
 from django.utils.datastructures import ImmutableList, OrderedSet
-from django.utils.deprecation import RemovedInDjango21Warning
 from django.utils.functional import cached_property
 from django.utils.text import camel_case_to_spaces, format_lazy
 from django.utils.translation import override
@@ -818,19 +816,6 @@ class Options:
         self._get_fields_cache[cache_key] = fields
         return fields
 
-    @property
-    def has_auto_field(self):
-        warnings.warn(
-            'Model._meta.has_auto_field is deprecated in favor of checking if '
-            'Model._meta.auto_field is not None.',
-            RemovedInDjango21Warning, stacklevel=2
-        )
-        return self.auto_field is not None
-
-    @has_auto_field.setter
-    def has_auto_field(self, value):
-        pass
-
     @cached_property
     def _property_names(self):
         """Return a set of the names of the properties defined on the model."""

docs/releases/2.1.txt

@@ -254,3 +254,5 @@ how to remove usage of these features.
 
 * The ``USE_ETAGS`` setting is removed. ``CommonMiddleware`` and
   ``django.utils.cache.patch_response_headers()`` no longer set ETags.
+
+* The ``Model._meta.has_auto_field`` attribute is removed.

tests/model_meta/test_removedindjango21.py

-import warnings
-
-from django.test import SimpleTestCase
-
-from .models import Person
-
-
-class HasAutoFieldTests(SimpleTestCase):
-
-    def test_get_warns(self):
-        with warnings.catch_warnings(record=True) as warns:
-            warnings.simplefilter('always')
-            Person._meta.has_auto_field
-        self.assertEqual(len(warns), 1)
-        self.assertEqual(
-            str(warns[0].message),
-            'Model._meta.has_auto_field is deprecated in favor of checking if '
-            'Model._meta.auto_field is not None.',
-        )
-
-    def test_set_does_nothing(self):
-        Person._meta.has_auto_field = True