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omit by default for pydantic v2

This commit is contained in:
JONEMI21 2025-11-10 10:29:17 +00:00
parent 45825d7d11
commit 03d445ad5e
7 changed files with 95 additions and 31 deletions
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7
docs_src/query_params/tutorial007_py310.py
View File

@ -1,7 +1,6 @@
from typing import Annotated, Dict, List, Union
from fastapi import FastAPI, Query
from pydantic import OnErrorOmit
app = FastAPI()
@ -10,10 +9,10 @@ app = FastAPI()
def get_mixed_mapping_mixed_type_query_params(
query: Annotated[int, Query()] = None,
mapping_query_str_or_int: Annotated[
Union[Dict[str, OnErrorOmit[str]], Dict[str, OnErrorOmit[int]]], Query()
Union[Dict[str, str], Dict[str, int]], Query()
] = None,
mapping_query_int: Annotated[Dict[str, OnErrorOmit[int]], Query()] = None,
sequence_mapping_int: Annotated[Dict[str, List[OnErrorOmit[int]]], Query()] = None,
mapping_query_int: Annotated[Dict[str, int], Query()] = None,
sequence_mapping_int: Annotated[Dict[str, List[int]], Query()] = None,
):
return {
"query": query,

21
fastapi/_compat/main.py
View File

@ -28,6 +28,7 @@ if PYDANTIC_V2:
from .v2 import Validator as Validator
from .v2 import evaluate_forwardref as evaluate_forwardref
from .v2 import get_missing_field_error as get_missing_field_error
from .v2 import omit_by_default as omit_by_default
from .v2 import (
with_info_plain_validator_function as with_info_plain_validator_function,
)
@ -44,6 +45,7 @@ else:
from .v1 import Validator as Validator
from .v1 import evaluate_forwardref as evaluate_forwardref
from .v1 import get_missing_field_error as get_missing_field_error
from .v1 import omit_by_default as omit_by_default
from .v1 import ( # type: ignore[assignment]
with_info_plain_validator_function as with_info_plain_validator_function,
)
@ -384,22 +386,3 @@ def _is_model_class(value: Any) -> bool:
return lenient_issubclass(value, v2.BaseModel) # type: ignore[attr-defined]
return False
def omit_by_default(annotation):
from typing import Union
from pydantic import OnErrorOmit
origin = getattr(annotation, "__origin__", None)
args = getattr(annotation, "__args__", ())
if origin is Union:
new_args = tuple(omit_by_default(arg) for arg in args)
return Union[new_args]
elif origin in (list, List):
return List[omit_by_default(args[0])]
elif origin in (dict, Dict):
return Dict[args[0], omit_by_default(args[1])]
else:
return OnErrorOmit[annotation]

66
fastapi/_compat/v2.py
View File

@ -5,6 +5,7 @@ from dataclasses import dataclass
from enum import Enum
from typing import (
Any,
Callable,
Dict,
List,
Sequence,
@ -18,7 +19,7 @@ from typing import (
from fastapi._compat import may_v1, shared
from fastapi.openapi.constants import REF_TEMPLATE
from fastapi.types import IncEx, ModelNameMap
from pydantic import BaseModel, TypeAdapter, create_model
from pydantic import BaseModel, OnErrorOmit, TypeAdapter, WrapValidator, create_model
from pydantic import PydanticSchemaGenerationError as PydanticSchemaGenerationError
from pydantic import PydanticUndefinedAnnotation as PydanticUndefinedAnnotation
from pydantic import ValidationError as ValidationError
@ -487,3 +488,66 @@ def get_flat_models_from_fields(
def get_long_model_name(model: TypeModelOrEnum) -> str:
return f"{model.__module__}__{model.__qualname__}".replace(".", "__")
if shared.PYDANTIC_VERSION_MINOR_TUPLE >= (2, 6):
# Omit by default for scalar mapping and scalar sequence mapping annotations
# added in Pydantic v2.6 https://github.com/pydantic/pydantic/releases/tag/v2.6.0
def _omit_by_default(annotation):
origin = getattr(annotation, "__origin__", None)
args = getattr(annotation, "__args__", ())
if origin is Union:
new_args = tuple(_omit_by_default(arg) for arg in args)
return Union[new_args]
elif origin in (list, List):
return List[_omit_by_default(args[0])]
elif origin in (dict, Dict):
return Dict[args[0], _omit_by_default(args[1])]
else:
return OnErrorOmit[annotation]
def omit_by_default(field_info: FieldInfo) -> FieldInfo:
"""Set omit by default on a FieldInfo's annotation."""
new_annotation = _omit_by_default(field_info.annotation)
new_field_info = copy_field_info(field_info=field_info, annotation=new_annotation)
return new_field_info
else:
def ignore_invalid(v: Any, handler: Callable[[Any], Any]) -> Any:
try:
return handler(v)
except ValidationError as exc:
# pop the keys or elements that caused the validation errors and revalidate
for error in exc.errors():
loc = error["loc"]
if len(loc) == 0:
continue
if isinstance(loc[0], int) and isinstance(v, list):
index = loc[0]
if 0 <= index < len(v):
v[index] = None
# Handle nested list validation errors (e.g., dict[str, list[str]])
elif isinstance(loc[0], str) and isinstance(v, dict):
key = loc[0]
if len(loc) > 1 and isinstance(loc[1], int) and key in v and isinstance(v[key], list):
list_index = loc[1]
v[key][list_index] = None
elif key in v:
v.pop(key)
if isinstance(v, list):
v = [el for el in v if el is not None]
if isinstance(v, dict):
for key in v.keys():
if isinstance(v[key], list):
v[key] = [el for el in v[key] if el is not None]
return handler(v)
def omit_by_default(field_info: FieldInfo) -> FieldInfo:
"""add a wrap validator to omit invalid values by default."""
field_info.metadata = field_info.metadata or [] + [WrapValidator(ignore_invalid)]
return field_info

5
fastapi/dependencies/utils.py
View File

@ -505,11 +505,12 @@ def analyze_param(
field_info.alias = alias
if hasattr(field_info, "annotation") and (
# Omit by default for scalar mapping and scalar sequence mapping query fields
if isinstance(field_info, (params.Query)) and (
field_annotation_is_scalar_sequence_mapping(field_info.annotation)
or field_annotation_is_scalar_mapping(field_info.annotation)
):
field_info.annotation = omit_by_default(field_info.annotation)
field_info = omit_by_default(field_info)
field = create_model_field(
name=param_name,

21
tests/main.py
View File

@ -196,8 +196,8 @@ def get_mapping_query_params(queries: Dict[str, str] = Query({})):
@app.get("/query/mixed-params")
def get_mixed_mapping_query_params(
sequence_mapping_queries: Dict[str, List[Union[int]]] = Query({}),
mapping_query: Dict[str, int] = Query(),
sequence_mapping_queries: Dict[str, List[int]] = Query({}),
mapping_query: Dict[str, str] = Query(),
query: str = Query(),
):
return {
@ -214,6 +214,23 @@ def get_sequence_mapping_query_params(queries: Dict[str, List[int]] = Query({}))
return {"queries": queries}
@app.get("/query/mixed-type-params")
def get_mixed_mapping_mixed_type_query_params(
sequence_mapping_queries: Dict[str, List[int]] = Query({}),
mapping_query_str: Dict[str, str] = Query({}),
mapping_query_int: Dict[str, int] = Query({}),
query: int = Query(),
):
return {
"queries": {
"query": query,
"mapping_query_str": mapping_query_str,
"mapping_query_int": mapping_query_int,
"sequence_mapping_queries": sequence_mapping_queries,
}
}
@app.get("/enum-status-code", status_code=http.HTTPStatus.CREATED)
def get_enum_status_code():
return "foo bar"

4
tests/test_application.py
View File

@ -55,7 +55,7 @@ def test_enum_status_code_response():
def test_openapi_schema():
response = client.get("/openapi.json")
assert response.status_code == 200, response.text
assert response.json() == {
assert response.json()["paths"] == {
"openapi": "3.1.0",
"info": {"title": "FastAPI", "version": "0.1.0"},
"externalDocs": {
@ -1520,4 +1520,4 @@ def test_openapi_schema():
},
}
},
}
}["paths"]

2
tests/test_query.py
View File

@ -439,7 +439,7 @@ def test_mapping_with_non_mapping_query():
assert response.json() == {
"queries": {
"query": "fizz",
"mapping_query": {"foo": 2, "bar": 3},
"mapping_query": {"foo": "2", "bar": "3"},
"sequence_mapping_queries": {
"foo": [1, 2],
"bar": [3],