From 57793b47657ace966ce8ce96d801ac0d85e5efc6 Mon Sep 17 00:00:00 2001
From: David Wobrock <david.wobrock@gmail.com>
Date: Thu, 7 Jul 2022 12:20:30 +0200
Subject: [PATCH] Refs #27236 -- Refactored out
 DeprecationForHistoricalMigrationMixin.

---
 django/db/models/fields/__init__.py | 35 +++-----------------------
 django/utils/deprecation.py         | 39 +++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 31 deletions(-)

diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 5381a3b17f..3757860f20 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -24,6 +24,7 @@ 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
@@ -111,7 +112,7 @@ def return_None():
 
 
 @total_ordering
-class Field(RegisterLookupMixin):
+class Field(DeprecationForHistoricalMigrationMixin, RegisterLookupMixin):
     """Base class for all field types"""
 
     # Designates whether empty strings fundamentally are allowed at the
@@ -137,8 +138,7 @@ class Field(RegisterLookupMixin):
             "%(date_field_label)s %(lookup_type)s."
         ),
     }
-    system_check_deprecated_details = None
-    system_check_removed_details = None
+    check_type = "fields"
 
     # Attributes that don't affect a column definition.
     # These attributes are ignored when altering the field.
@@ -263,7 +263,7 @@ class Field(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):
@@ -441,33 +441,6 @@ class Field(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
diff --git a/django/utils/deprecation.py b/django/utils/deprecation.py
index caed5b25d4..eaef496138 100644
--- a/django/utils/deprecation.py
+++ b/django/utils/deprecation.py
@@ -157,3 +157,42 @@ 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 []