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Code Issues 25 Releases Wiki Activity

Fixed #35969 -- Disallowed specifying a USING clause for altered generated field.

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PostgreSQL versions 16.5 and above no longer permit the use
of a USING clause when changing the type of a generated column.
This commit is contained in:
lufafajoshua 2024-12-09 15:37:05 +03:00 committed by Sarah Boyce
parent 0d9872fc9a
commit 27375ad50e
2 changed files with 33 additions and 0 deletions
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2
django/db/backends/postgresql/schema.py
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@ -120,6 +120,8 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
return None
def _using_sql(self, new_field, old_field):
if new_field.generated:
return ""
using_sql = " USING %(column)s::%(type)s"
new_internal_type = new_field.get_internal_type()
old_internal_type = old_field.get_internal_type()

31
tests/migrations/test_operations.py
View File

@ -6415,6 +6415,37 @@ class OperationTests(OperationTestBase):
operation.database_backwards(app_label, editor, new_state, project_state)
self.assertColumnNotExists(f"{app_label}_pony", "modified_pink")
@skipUnlessDBFeature("supports_stored_generated_columns")
def test_generated_field_changes_output_field(self):
app_label = "test_gfcof"
operation = migrations.AddField(
"Pony",
"modified_pink",
models.GeneratedField(
expression=F("pink") + F("pink"),
output_field=models.IntegerField(),
db_persist=True,
),
)
from_state, to_state = self.make_test_state(app_label, operation)
# Add generated column.
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, from_state, to_state)
# Update output_field used in the generated field.
operation = migrations.AlterField(
"Pony",
"modified_pink",
models.GeneratedField(
expression=F("pink") + F("pink"),
output_field=models.DecimalField(decimal_places=2, max_digits=16),
db_persist=True,
),
)
from_state = to_state.clone()
to_state = self.apply_operations(app_label, from_state, [operation])
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, from_state, to_state)
@skipUnlessDBFeature("supports_stored_generated_columns")
def test_add_generated_field_stored(self):
self._test_add_generated_field(db_persist=True)