Refs #30446, Refs #34944 -- Fixed crash when adding GeneratedField with string Value().

This should allow smarter output_field inferring in functions dealing
with text expressions.

Regression in f333e3513e8bdf5ffeb6eeb63021c230082e6f95.

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/schema/tests.py b/tests/schema/tests.py
index 72f90c934b..1298b32caf 100644
--- a/tests/schema/tests.py
+++ b/tests/schema/tests.py
@@ -844,6 +844,23 @@ class SchemaTests(TransactionTestCase):
 
     @isolate_apps("schema")
     @skipUnlessDBFeature("supports_stored_generated_columns")
+    def test_add_generated_field_with_string_value(self):
+        class GeneratedFieldStringValueModel(Model):
+            value = GeneratedField(expression=Value("static string"), db_persist=True)
+
+            class Meta:
+                app_label = "schema"
+
+        with CaptureQueriesContext(connection) as ctx:
+            with connection.schema_editor() as editor:
+                editor.create_model(GeneratedFieldStringValueModel)
+        self.assertIs(
+            any("None" in query["sql"] for query in ctx.captured_queries),
+            False,
+        )
+
+    @isolate_apps("schema")
+    @skipUnlessDBFeature("supports_stored_generated_columns")
     def test_add_generated_field_with_output_field(self):
         class GeneratedFieldOutputFieldModel(Model):
             price = DecimalField(max_digits=7, decimal_places=2)