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Background:
PydanticUndefinedAnnotation
: forward references in importeddataclass
forTypeAdapter
pydantic/pydantic#7111) thatTypeAdapter
needs to look back in the stack for typing context (e.g. in globals). Therefore, FastAPI cannot currently use non-Pydantic types with forward type references properly.__get_validators__()
in favor of the new schema design.Solution:
Skip constructing
dataclass
schema under Pydantic v2 through__get_pydantic_core_schema__()
, which:__get_validators__()
, so the latter can stay for v1 compatibility.Fixes #466