"""Pydantic-specific errors."""
from __future__ import annotations as _annotations
import re
from typing_extensions import Literal, Self
from ._migration import getattr_migration
from .version import version_short
__all__ = (
'PydanticUserError',
'PydanticUndefinedAnnotation',
'PydanticImportError',
'PydanticSchemaGenerationError',
'PydanticInvalidForJsonSchema',
'PydanticErrorCodes',
)
# We use this URL to allow for future flexibility about how we host the docs, while allowing for Pydantic
# code in the while with "old" URLs to still work.
# 'u' refers to "user errors" - e.g. errors caused by developers using pydantic, as opposed to validation errors.
DEV_ERROR_DOCS_URL = f'https://errors.pydantic.dev/{version_short()}/u/'
PydanticErrorCodes = Literal[
'class-not-fully-defined',
'custom-json-schema',
'decorator-missing-field',
'discriminator-no-field',
'discriminator-alias-type',
'discriminator-needs-literal',
'discriminator-alias',
'discriminator-validator',
'callable-discriminator-no-tag',
'typed-dict-version',
'model-field-overridden',
'model-field-missing-annotation',
'config-both',
'removed-kwargs',
'invalid-for-json-schema',
'json-schema-already-used',
'base-model-instantiated',
'undefined-annotation',
'schema-for-unknown-type',
'import-error',
'create-model-field-definitions',
'create-model-config-base',
'validator-no-fields',
'validator-invalid-fields',
'validator-instance-method',
'root-validator-pre-skip',
'model-serializer-instance-method',
'validator-field-config-info',
'validator-v1-signature',
'validator-signature',
'field-serializer-signature',
'model-serializer-signature',
'multiple-field-serializers',
'invalid_annotated_type',
'type-adapter-config-unused',
'root-model-extra',
'unevaluable-type-annotation',
'dataclass-init-false-extra-allow',
'clashing-init-and-init-var',
'model-config-invalid-field-name',
'with-config-on-model',
'dataclass-on-model',
]
class PydanticErrorMixin:
"""A mixin class for common functionality shared by all Pydantic-specific errors.
Attributes:
message: A message describing the error.
code: An optional error code from PydanticErrorCodes enum.
"""
def __init__(self, message: str, *, code: PydanticErrorCodes | None) -> None:
self.message = message
self.code = code
def __str__(self) -> str:
if self.code is None:
return self.message
else:
return f'{self.message}\n\nFor further information visit {DEV_ERROR_DOCS_URL}{self.code}'
class PydanticUserError(PydanticErrorMixin, TypeError):
"""An error raised due to incorrect use of Pydantic."""
class PydanticUndefinedAnnotation(PydanticErrorMixin, NameError):
"""A subclass of `NameError` raised when handling undefined annotations during `CoreSchema` generation.
Attributes:
name: Name of the error.
message: Description of the error.
"""
def __init__(self, name: str, message: str) -> None:
self.name = name
super().__init__(message=message, code='undefined-annotation')
@classmethod
def from_name_error(cls, name_error: NameError) -> Self:
"""Convert a `NameError` to a `PydanticUndefinedAnnotation` error.
Args:
name_error: `NameError` to be converted.
Returns:
Converted `PydanticUndefinedAnnotation` error.
"""
try:
name = name_error.name # type: ignore # python > 3.10
except AttributeError:
name = re.search(r".*'(.+?)'", str(name_error)).group(1) # type: ignore[union-attr]
return cls(name=name, message=str(name_error))
class PydanticImportError(PydanticErrorMixin, ImportError):
"""An error raised when an import fails due to module changes between V1 and V2.
Attributes:
message: Description of the error.
"""
def __init__(self, message: str) -> None:
super().__init__(message, code='import-error')
class PydanticSchemaGenerationError(PydanticUserError):
"""An error raised during failures to generate a `CoreSchema` for some type.
Attributes:
message: Description of the error.
"""
def __init__(self, message: str) -> None:
super().__init__(message, code='schema-for-unknown-type')
class PydanticInvalidForJsonSchema(PydanticUserError):
"""An error raised during failures to generate a JSON schema for some `CoreSchema`.
Attributes:
message: Description of the error.
"""
def __init__(self, message: str) -> None:
super().__init__(message, code='invalid-for-json-schema')
__getattr__ = getattr_migration(__name__)
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