Comments (3)
Your type annotation is incorrect. A field of typeUnion[int, Inner, List[Inner]]
cannot be None.
from marshmallow_dataclass.
oh how come? the following is valid. am i missing something?
@dataclass
class Inner:
inner_var: int = None
from marshmallow_dataclass.
None is not an instance of int. You can use Optional[int]
or Union[int, None]
See typing — Support for type hints — Python 3.8.3 documentation
https://docs.python.org/3/library/typing.html#typing.Optional
from marshmallow_dataclass.
Related Issues (20)
- Using NewType raises TypeError HOT 3
- marshmallow_dataclass.class_schema() breaks classes HOT 3
- Misunderstanding about how Union types are read from a JSON? HOT 3
- Cyclic references break when using `class_schema` in a class decorator HOT 1
- Add native marshmallow.fields.Enum suport HOT 1
- str | None fails HOT 5
- Enum parameters are ignored when loading a schema HOT 3
- field_for_schema can use _RECURSION_GUARD.seen_classes before it is initialized
- TypeError when creating a marshmallow schema from dataclass inherited from generic class HOT 1
- Enum fields always cast as JSON instead of native type
- Issues with typeguard package v3 HOT 3
- Error when using marshmallow_dataclass with attr.s HOT 1
- Arch Linux package? HOT 4
- Ability to configure custom Nested field class
- 8.5.13 broken on py3.9? HOT 3
- mypy: error: "Type[X]" has no attribute "Schema" [attr-defined] HOT 1
- Validating enum type HOT 1
- Union field is broken: The order of Union arguments is indeterminate
- Union with generic types is broken HOT 3
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from marshmallow_dataclass.