52 lines
1.6 KiB
Python
52 lines
1.6 KiB
Python
import typing
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import marshmallow
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class Sequence(marshmallow.fields.List):
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"""
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A sequence field, basically an immutable version of the list field.
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"""
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def _deserialize( # type: ignore[override]
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self,
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value: typing.Any,
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attr: typing.Any,
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data: typing.Any,
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**kwargs: typing.Any,
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) -> typing.Optional[typing.Sequence[typing.Any]]:
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optional_list = super()._deserialize(value, attr, data, **kwargs)
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return None if optional_list is None else tuple(optional_list)
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class Set(marshmallow.fields.List):
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"""
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A set field. A set is an unordered/mutable collection of unique elements, same for frozenset
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except it's immutable.
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Notes:
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Beware the a Set guarantees uniqueness in the resulting list but in return the item's order
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will be random. So if the order matters, use a List or Sequence !
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"""
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def __init__(
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self,
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cls_or_instance: typing.Union[marshmallow.fields.Field, type],
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frozen: bool = False,
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**kwargs,
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):
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super().__init__(cls_or_instance, **kwargs)
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self.set_type: typing.Type[typing.Union[frozenset, set]] = (
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frozenset if frozen else set
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)
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def _deserialize( # type: ignore[override]
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self,
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value: typing.Any,
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attr: typing.Any,
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data: typing.Any,
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**kwargs: typing.Any,
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) -> typing.Union[typing.Set[typing.Any], typing.FrozenSet[typing.Any], None]:
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optional_list = super()._deserialize(value, attr, data, **kwargs)
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return None if optional_list is None else self.set_type(optional_list)
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