Refs #27236 -- Reverted "Refs #27236 -- Refactored out DeprecationForHistoricalMigrationMixin."

This reverts commit 57793b47657ace966ce8ce96d801ac0d85e5efc6.

django/db/models/fields/__init__.py

@@ -24,7 +24,6 @@ from django.utils.dateparse import (
     parse_duration,
     parse_time,
 )
-from django.utils.deprecation import DeprecationForHistoricalMigrationMixin
 from django.utils.duration import duration_microseconds, duration_string
 from django.utils.functional import Promise, cached_property
 from django.utils.ipv6 import clean_ipv6_address
@@ -112,7 +111,7 @@ def return_None():
 
 
 @total_ordering
-class Field(DeprecationForHistoricalMigrationMixin, RegisterLookupMixin):
+class Field(RegisterLookupMixin):
     """Base class for all field types"""
 
     # Designates whether empty strings fundamentally are allowed at the
@@ -138,7 +137,8 @@ class Field(DeprecationForHistoricalMigrationMixin, RegisterLookupMixin):
             "%(date_field_label)s %(lookup_type)s."
         ),
     }
-    check_type = "fields"
+    system_check_deprecated_details = None
+    system_check_removed_details = None
 
     # Attributes that don't affect a column definition.
     # These attributes are ignored when altering the field.
@@ -263,7 +263,7 @@ class Field(DeprecationForHistoricalMigrationMixin, RegisterLookupMixin):
             *self._check_null_allowed_for_primary_keys(),
             *self._check_backend_specific_checks(**kwargs),
             *self._check_validators(),
-            *self.check_deprecation_details(),
+            *self._check_deprecation_details(),
         ]
 
     def _check_field_name(self):
@@ -441,6 +441,33 @@ class Field(DeprecationForHistoricalMigrationMixin, RegisterLookupMixin):
                 )
         return errors
 
+    def _check_deprecation_details(self):
+        if self.system_check_removed_details is not None:
+            return [
+                checks.Error(
+                    self.system_check_removed_details.get(
+                        "msg",
+                        "%s has been removed except for support in historical "
+                        "migrations." % self.__class__.__name__,
+                    ),
+                    hint=self.system_check_removed_details.get("hint"),
+                    obj=self,
+                    id=self.system_check_removed_details.get("id", "fields.EXXX"),
+                )
+            ]
+        elif self.system_check_deprecated_details is not None:
+            return [
+                checks.Warning(
+                    self.system_check_deprecated_details.get(
+                        "msg", "%s has been deprecated." % self.__class__.__name__
+                    ),
+                    hint=self.system_check_deprecated_details.get("hint"),
+                    obj=self,
+                    id=self.system_check_deprecated_details.get("id", "fields.WXXX"),
+                )
+            ]
+        return []
+
     def get_col(self, alias, output_field=None):
         if alias == self.model._meta.db_table and (
             output_field is None or output_field == self

django/utils/deprecation.py

@@ -157,42 +157,3 @@ class MiddlewareMixin:
                 thread_sensitive=True,
             )(request, response)
         return response
-
-
-class DeprecationForHistoricalMigrationMixin:
-    system_check_deprecated_details = None
-    system_check_removed_details = None
-    check_type = ""
-
-    def check_deprecation_details(self):
-        from django.core import checks
-
-        if self.system_check_removed_details is not None:
-            return [
-                checks.Error(
-                    self.system_check_removed_details.get(
-                        "msg",
-                        "%s has been removed except for support in historical "
-                        "migrations." % self.__class__.__name__,
-                    ),
-                    hint=self.system_check_removed_details.get("hint"),
-                    obj=self,
-                    id=self.system_check_removed_details.get(
-                        "id", f"{self.check_type}.EXXX"
-                    ),
-                )
-            ]
-        elif self.system_check_deprecated_details is not None:
-            return [
-                checks.Warning(
-                    self.system_check_deprecated_details.get(
-                        "msg", "%s has been deprecated." % self.__class__.__name__
-                    ),
-                    hint=self.system_check_deprecated_details.get("hint"),
-                    obj=self,
-                    id=self.system_check_deprecated_details.get(
-                        "id", f"{self.check_type}.WXXX"
-                    ),
-                )
-            ]
-        return []