feat: Add support for Literal types. #534
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This commit extends support of dataclasses_json to dataclasses with fields annotated with Literal types. Literal types allow users to specify a list of valid values, e.g., ```python @DataClass class DataClassWithLiteral(DataClassJsonMixin): languages: Literal["C", "C++", "Java"] ``` When de-serializing data, this commit now validates that the JSON's values are one of those specified in the Literal type. Change in behavior: Using literal types would previously give users the following warning: ``` dataclasses_json/mm.py:357: UserWarning: Unknown type C at Foo.langs: typing.Literal['C', 'C++', 'Java']. It's advised to pass the correct marshmallow type to `mm_field`. ```
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Just ran into this issue and saw that it had an open PR. Awesome, thank you! Excited to see it merged. |
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This commit extends support of dataclasses_json to dataclasses with fields annotated with Literal types. Literal types allow users to specify a list of valid values, e.g.,
When de-serializing data, this commit now validates that the JSON's values are one of those specified in the Literal type.
Change in behavior:
Using literal types would previously give users the following warning:
Note: this is my first PR to the dataclasses_json library, so I'm not 100% sure what the conventions are. Happy to make any changes requested!