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from typing import Union |
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from jsons._common_impl import get_class_name, NoneType |
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from jsons._compatibility_impl import get_union_params |
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from jsons._dump_impl import dump |
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from jsons.exceptions import JsonsError, SerializationError |
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def default_union_serializer(obj: object, cls: Union, **kwargs) -> object: |
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""" |
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Serialize an object to any matching type of the given union. The first |
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successful serialization is returned. |
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:param obj: The object that is to be serialized. |
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:param cls: The Union type with a generic (e.g. Union[str, int]). |
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:param kwargs: Any keyword arguments that are passed through the |
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serialization process. |
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:return: An object of the first type of the Union that could be |
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serialized successfully. |
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""" |
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sub_types = get_union_params(cls) |
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# Cater for Optional[...]/Union[None, ...] first to avoid blindly |
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# string-ifying None in later serializers. |
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if obj is None and NoneType in sub_types: |
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return obj |
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for sub_type in sub_types: |
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try: |
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return dump(obj, sub_type, **kwargs) |
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except JsonsError: |
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pass # Try the next one. |
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else: |
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args_msg = ', '.join([get_class_name(cls_) |
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for cls_ in get_union_params(cls)]) |
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err_msg = ('Could not match the object of type "{}" to any type of ' |
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'the Union: {}'.format(str(cls), args_msg)) |
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raise SerializationError(err_msg) |
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ramonhagenaars /
jsons
