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[dataclass] Fix dataclass mutable defaults error #1067

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Nov 6, 2023
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[dataclass] Fix dataclass mutable defaults error #1067

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6 changes: 6 additions & 0 deletions pgx/_src/struct.py
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,12 @@ def create(cls, kernel):
if "_flax_dataclass" in clz.__dict__:
return clz

for name in clz.__annotations__.keys():
if hasattr(clz, name):
obj = getattr(clz, name)
if obj.__hash__ is None:
setattr(clz, name, field(default_factory=lambda x=obj: x))

data_clz = dataclasses.dataclass(frozen=True)(clz) # type: ignore
meta_fields = []
data_fields = []
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