Fixed #20484 -- Added model validation for GenericIPAddressField

GenericIPAddressField must not allow blank for NOT NULL fields

Thanks Erik Romijn.

1 files changed, 2 insertions, 0 deletions

diff --git a/django/core/management/validation.py b/django/core/management/validation.py
index 2040a14582..a6d6a76985 100644
--- a/django/core/management/validation.py
+++ b/django/core/management/validation.py
@@ -113,6 +113,8 @@ def get_validation_errors(outfile, app=None):
                 e.add(opts, '"%s": BooleanFields do not accept null values. Use a NullBooleanField instead.' % f.name)
             if isinstance(f, models.FilePathField) and not (f.allow_files or f.allow_folders):
                 e.add(opts, '"%s": FilePathFields must have either allow_files or allow_folders set to True.' % f.name)
+            if isinstance(f, models.GenericIPAddressField) and not getattr(f, 'null', False) and getattr(f, 'blank', False):
+                e.add(opts, '"%s": GenericIPAddressField can not accept blank values if null values are not allowed, as blank values are stored as null.' % f.name)
             if f.choices:
                 if isinstance(f.choices, six.string_types) or not is_iterable(f.choices):
                     e.add(opts, '"%s": "choices" should be iterable (e.g., a tuple or list).' % f.name)