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| author | Jeremy Nauta <jeremypnauta@gmail.com> | 2023-07-06 20:36:48 -0600 |
|---|---|---|
| committer | Mariusz Felisiak <felisiak.mariusz@gmail.com> | 2023-09-07 06:19:08 +0200 |
| commit | f333e3513e8bdf5ffeb6eeb63021c230082e6f95 (patch) | |
| tree | 45840089369287128724be0a63e3af36f3178469 /django/db/models/query_utils.py | |
| parent | cafe7266ee69f7e017ddbc0d440084ace559b04b (diff) | |
Fixed #31300 -- Added GeneratedField model field.
Thanks Adam Johnson and Paolo Melchiorre for reviews.
Co-Authored-By: Lily Foote <code@lilyf.org>
Co-Authored-By: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Diffstat (limited to 'django/db/models/query_utils.py')
| -rw-r--r-- | django/db/models/query_utils.py | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/django/db/models/query_utils.py b/django/db/models/query_utils.py index fcda30b3a7..9754864eef 100644 --- a/django/db/models/query_utils.py +++ b/django/db/models/query_utils.py @@ -198,6 +198,10 @@ class DeferredAttribute: # might be able to reuse the already loaded value. Refs #18343. val = self._check_parent_chain(instance) if val is None: + if instance.pk is None and self.field.generated: + raise FieldError( + "Cannot read a generated field from an unsaved model." + ) instance.refresh_from_db(fields=[field_name]) else: data[field_name] = val |