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fix: Avro dataclass introspect typing #976

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Oct 16, 2024
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fix: Avro dataclass introspect typing #976

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11 changes: 9 additions & 2 deletions src/karapace/avro_dataclasses/introspect.py
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Original file line number Diff line number Diff line change
Expand Up @@ -42,10 +42,17 @@ def _field_type_array(field: Field, origin: type, type_: object) -> AvroType:
else:
(inner_type,) = get_args(type_)

items: AvroType
if is_dataclass(inner_type):
assert isinstance(inner_type, type)
items = record_schema(inner_type)
else:
items = _field_type(field, inner_type)

return {
"name": f"one_of_{field.name}",
"type": "array",
"items": (record_schema(inner_type) if is_dataclass(inner_type) else _field_type(field, inner_type)),
"items": items,
}


Expand Down Expand Up @@ -128,7 +135,7 @@ def _field_type(field: Field, type_: object) -> AvroType: # pylint: disable=too
T = TypeVar("T", str, int, bool, Enum, None)


def transform_default(type_: type[T], default: T) -> str | int | bool | None:
def transform_default(type_: type[T] | str, default: T) -> str | int | bool | None:
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What is the failure case that necessitates the addition of str here? Just curious.

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This is pure typing correction. It looks that primitive types use string instead of type[T].

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Tracking this to here:

https://github.com/python/typeshed/blob/6feca188689e14cdacd8dbf8bc9cf0635993027a/stdlib/dataclasses.pyi#L111

When originally authored, this type was type, only changed recently and I guess propagated in most recent mypy bump:

python/typeshed@6b2033a

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_field_type doesn't give a type error because it accepts object and makes no assumptions. It's probably somewhat likely to break when the new deferred annotations arrive, but I wouldn't deal with that until it's possible to test with.

if isinstance(default, Enum):
assert isinstance(type_, type)
assert issubclass(type_, Enum)
Expand Down
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