v2.py — fastapi Source File

Source Code

import re
import warnings
from collections.abc import Sequence
from copy import copy
from dataclasses import dataclass, is_dataclass
from enum import Enum
from functools import lru_cache
from typing import (
    Annotated,
    Any,
    Union,
    cast,
)

from fastapi._compat import lenient_issubclass, shared
from fastapi.openapi.constants import REF_TEMPLATE
from fastapi.types import IncEx, ModelNameMap, UnionType
from pydantic import BaseModel, ConfigDict, Field, TypeAdapter, create_model
from pydantic import PydanticSchemaGenerationError as PydanticSchemaGenerationError
from pydantic import PydanticUndefinedAnnotation as PydanticUndefinedAnnotation
from pydantic import ValidationError as ValidationError
from pydantic._internal._schema_generation_shared import (  # type: ignore[attr-defined]
    GetJsonSchemaHandler as GetJsonSchemaHandler,
)
from pydantic._internal._typing_extra import eval_type_lenient
from pydantic.fields import FieldInfo as FieldInfo
from pydantic.json_schema import GenerateJsonSchema as GenerateJsonSchema
from pydantic.json_schema import JsonSchemaValue as JsonSchemaValue
from pydantic_core import CoreSchema as CoreSchema
from pydantic_core import PydanticUndefined
from pydantic_core import Url as Url
from pydantic_core.core_schema import (
    with_info_plain_validator_function as with_info_plain_validator_function,
)
from typing_extensions import Literal, get_args, get_origin

RequiredParam = PydanticUndefined
Undefined = PydanticUndefined
evaluate_forwardref = eval_type_lenient

# TODO: remove when dropping support for Pydantic < v2.12.3
_Attrs = {
    "default": ...,
    "default_factory": None,
    "alias": None,
    "alias_priority": None,
    "validation_alias": None,
    "serialization_alias": None,
    "title": None,
    "field_title_generator": None,
    "description": None,
    "examples": None,
    "exclude": None,
    "exclude_if": None,
    "discriminator": None,
    "deprecated": None,
    "json_schema_extra": None,
    "frozen": None,
    "validate_default": None,
    "repr": True,
// ... (376 more lines)