Teach "django-admin.py validate" to forbid nullable primary keys.

Fixes #15884, with thanks to JustinTArthur and Julie Pichon.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16678 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 2 insertions, 0 deletions

diff --git a/django/core/management/validation.py b/django/core/management/validation.py
index 55665804c4..c13b19df97 100644
--- a/django/core/management/validation.py
+++ b/django/core/management/validation.py
@@ -39,6 +39,8 @@ def get_validation_errors(outfile, app=None):
                 e.add(opts, '"%s": You can\'t use "id" as a field name, because each model automatically gets an "id" field if none of the fields have primary_key=True. You need to either remove/rename your "id" field or add primary_key=True to a field.' % f.name)
             if f.name.endswith('_'):
                 e.add(opts, '"%s": Field names cannot end with underscores, because this would lead to ambiguous queryset filters.' % f.name)
+            if f.primary_key and f.null:
+                e.add(opts, '"%s": Primary key fields cannot have null=True.' % f.name)
             if isinstance(f, models.CharField):
                 try:
                     max_length = int(f.max_length)