Fixed #28313 -- Added model name max length check of 100 characters in contrib.contentttypes.

2 files changed, 25 insertions, 1 deletions

diff --git a/django/contrib/contenttypes/apps.py b/django/contrib/contenttypes/apps.py
index 095dbf5615..1a8e25b98e 100644
--- a/django/contrib/contenttypes/apps.py
+++ b/django/contrib/contenttypes/apps.py
@@ -1,5 +1,7 @@
 from django.apps import AppConfig
-from django.contrib.contenttypes.checks import check_generic_foreign_keys
+from django.contrib.contenttypes.checks import (
+    check_generic_foreign_keys, check_model_name_lengths,
+)
 from django.core import checks
 from django.db.models.signals import post_migrate, pre_migrate
 from django.utils.translation import gettext_lazy as _
@@ -17,3 +19,4 @@ class ContentTypesConfig(AppConfig):
         pre_migrate.connect(inject_rename_contenttypes_operations, sender=self)
         post_migrate.connect(create_contenttypes)
         checks.register(check_generic_foreign_keys, checks.Tags.models)
+        checks.register(check_model_name_lengths, checks.Tags.models)
diff --git a/django/contrib/contenttypes/checks.py b/django/contrib/contenttypes/checks.py
index d21df40f46..3e802ea26b 100644
--- a/django/contrib/contenttypes/checks.py
+++ b/django/contrib/contenttypes/checks.py
@@ -1,6 +1,7 @@
 from itertools import chain
 
 from django.apps import apps
+from django.core.checks import Error
 
 
 def check_generic_foreign_keys(app_configs=None, **kwargs):
@@ -18,3 +19,23 @@ def check_generic_foreign_keys(app_configs=None, **kwargs):
     for field in fields:
         errors.extend(field.check())
     return errors
+
+
+def check_model_name_lengths(app_configs=None, **kwargs):
+    if app_configs is None:
+        models = apps.get_models()
+    else:
+        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
+    errors = []
+    for model in models:
+        if len(model._meta.model_name) > 100:
+            errors.append(
+                Error(
+                    'Model names must be at most 100 characters (got %d).' % (
+                        len(model._meta.model_name),
+                    ),
+                    obj=model,
+                    id='contenttypes.E005',
+                )
+            )
+    return errors