Fixed #18866 -- added validation error for verbose_name longer than 39 characters

Added a validation error check when creating the permissions for model, to avoid
cryptic database error when the verbose_name is longer than 39 characters
thanks elena for reporting it

AUTHORS

@@ -463,6 +463,7 @@ answer newbie questions, and generally made Django that much better:
     Neal Norwitz <nnorwitz@google.com>
     Todd O'Bryan <toddobryan@mac.com>
     Alex Ogier <alex.ogier@gmail.com>
+    Joao Oliveira <joaoxsouls@gmail.com>
     Selwin Ong <selwin@ui.co.id>
     Gerardo Orozco <gerardo.orozco.mosqueda@gmail.com>
     Christian Oudard <christian.oudard@gmail.com>

django/contrib/auth/management/__init__.py

@@ -99,6 +99,12 @@ def create_permissions(app, created_models, verbosity, db=DEFAULT_DB_ALIAS, **kw
         for ctype, (codename, name) in searched_perms
         if (ctype.pk, codename) not in all_perms
     ]
+    # Validate the permissions before bulk_creation to avoid cryptic
+    # database error when the verbose_name is longer than 50 characters
+    for perm in perms:
+        if len(perm.name) > 50:
+            raise exceptions.ValidationError(
+                "The verbose_name of %s is longer than 39 characters" % perm.content_type)
     auth_app.Permission.objects.using(db).bulk_create(perms)
     if verbosity >= 2:
         for perm in perms:

django/contrib/auth/tests/test_management.py

@@ -8,6 +8,7 @@ from django.contrib.auth.models import User
 from django.contrib.auth.tests.custom_user import CustomUser
 from django.contrib.auth.tests.utils import skipIfCustomUser
 from django.contrib.contenttypes.models import ContentType
+from django.core import exceptions
 from django.core.management import call_command
 from django.core.management.base import CommandError
 from django.core.management.validation import get_validation_errors
@@ -201,10 +202,12 @@ class PermissionTestCase(TestCase):
     def setUp(self):
         self._original_permissions = models.Permission._meta.permissions[:]
         self._original_default_permissions = models.Permission._meta.default_permissions
+        self._original_verbose_name = models.Permission._meta.verbose_name
 
     def tearDown(self):
         models.Permission._meta.permissions = self._original_permissions
         models.Permission._meta.default_permissions = self._original_default_permissions
+        models.Permission._meta.verbose_name = self._original_verbose_name
         ContentType.objects.clear_cache()
 
     def test_duplicated_permissions(self):
@@ -258,3 +261,12 @@ class PermissionTestCase(TestCase):
         self.assertEqual(models.Permission.objects.filter(
             content_type=permission_content_type,
         ).count(), 1)
+
+    def test_verbose_name_length(self):
+        permission_content_type = ContentType.objects.get_by_natural_key('auth', 'permission')
+        models.Permission.objects.filter(content_type=permission_content_type).delete()
+        models.Permission._meta.verbose_name = "some ridiculously long verbose name that is out of control"
+
+        six.assertRaisesRegex(self, exceptions.ValidationError,
+            "The verbose_name of permission is longer than 39 characters",
+            create_permissions, models, [], verbosity=0)