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🐛 Fix optional sequence handling with new union syntax from Python 3.10 (#14430) 

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
This commit is contained in:
Victorien 2025-12-02 17:59:38 +01:00 committed by GitHub
parent cff2236dac
commit 80d69ae0bb
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2 changed files with 16 additions and 3 deletions
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4
fastapi/_compat/v2.py
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@ -17,7 +17,7 @@ from typing import (
from fastapi._compat import may_v1, shared
from fastapi.openapi.constants import REF_TEMPLATE
from fastapi.types import IncEx, ModelNameMap
from fastapi.types import IncEx, ModelNameMap, UnionType
from pydantic import BaseModel, TypeAdapter, create_model
from pydantic import PydanticSchemaGenerationError as PydanticSchemaGenerationError
from pydantic import PydanticUndefinedAnnotation as PydanticUndefinedAnnotation
@ -381,7 +381,7 @@ def copy_field_info(*, field_info: FieldInfo, annotation: Any) -> FieldInfo:
def serialize_sequence_value(*, field: ModelField, value: Any) -> Sequence[Any]:
origin_type = get_origin(field.field_info.annotation) or field.field_info.annotation
if origin_type is Union: # Handle optional sequences
if origin_type is Union or origin_type is UnionType: # Handle optional sequences
union_args = get_args(field.field_info.annotation)
for union_arg in union_args:
if union_arg is type(None):

15
tests/test_compat.py
View File

@ -14,7 +14,7 @@ from fastapi.testclient import TestClient
from pydantic import BaseModel, ConfigDict
from pydantic.fields import FieldInfo
from .utils import needs_py_lt_314, needs_pydanticv2
from .utils import needs_py310, needs_py_lt_314, needs_pydanticv2
@needs_pydanticv2
@ -148,6 +148,19 @@ def test_serialize_sequence_value_with_optional_list():
assert isinstance(result, list)
@needs_pydanticv2
@needs_py310
def test_serialize_sequence_value_with_optional_list_pipe_union():
"""Test that serialize_sequence_value handles optional lists correctly (with new syntax)."""
from fastapi._compat import v2
field_info = FieldInfo(annotation=list[str] | None)
field = v2.ModelField(name="items", field_info=field_info)
result = v2.serialize_sequence_value(field=field, value=["a", "b", "c"])
assert result == ["a", "b", "c"]
assert isinstance(result, list)
@needs_pydanticv2
def test_serialize_sequence_value_with_none_first_in_union():
"""Test that serialize_sequence_value handles Union[None, List[...]] correctly."""