Model.full_clean() errors with GeneratedField

[Claude Paroz]

When running full_clean() on an unsaved model instance, the folllowing error is generated:

AttributeError: Cannot read a generated field from an unsaved model.

Reproducible with following test:

--- a/tests/model_fields/test_generatedfield.py
+++ b/tests/model_fields/test_generatedfield.py
@@ -177,6 +177,10 @@ class GeneratedFieldTestMixin:
         with self.assertRaises(IntegrityError):
             self.base_model.objects.create()
 
+    def test_full_clean(self):
+        m = self.base_model(a=2, b=4)
+        m.full_clean()
+
     def test_save(self):
         # Insert.
         m = self.base_model(a=2, b=4)

[Natalia Bidart]

Hello, thank you for your report! And thank you for providing a failing test.

I'm accepting given the failing test and that there is nothing in the docs stating that full_clean would not be supported for models including a GeneratedFields, so while more expert input is needed (adding them as CC), this seems like a valid issue.

Regression in f333e3513e8bdf5ffeb6eeb63021c230082e6f95

[Mariusz Felisiak]

​PR

[GitHub <noreply@…>]

In 4879907:

Fixed #35127 -- Made Model.full_clean() ignore GeneratedFields.

Thanks Claude Paroz for the report.

Regression in f333e3513e8bdf5ffeb6eeb63021c230082e6f95.

[Mariusz Felisiak <felisiak.mariusz@…>]

In ee78fe3:

[5.0.x] Fixed #35127 -- Made Model.full_clean() ignore GeneratedFields.

Thanks Claude Paroz for the report.

Regression in f333e3513e8bdf5ffeb6eeb63021c230082e6f95.
Backport of 4879907223d70ee1a82474d9286ccfa5dae96971 from main