无法从 dict 反序列化为 Message

[MeetWq]

如以下的代码：

def test_message_deserialize():
    """测试消息反序列化"""
    from nonebot.adapters.qq import Message, MessageSegment
    from nonebot.compat import type_validate_python

    msg = type_validate_python(Message, [{"type": "text", "data": {"text": "test"}}])
    assert msg == Message(MessageSegment.text("test"))

会出现如下报错：

_________________________________________ test_message_deserialize _________________________________________

    def test_message_deserialize():
        """测试消息反序列化"""
        from nonebot.adapters.qq import Message, MessageSegment
        from nonebot.compat import type_validate_python

>       msg = type_validate_python(Message, [{"type": "text", "data": {"text": "test"}}])

tests/test_qq.py:338:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.venv/lib/python3.10/site-packages/nonebot/compat.py:225: in type_validate_python
    return TypeAdapter(type_).validate_python(data)
.venv/lib/python3.10/site-packages/pydantic/type_adapter.py:135: in wrapped
    return func(self, *args, **kwargs)
.venv/lib/python3.10/site-packages/pydantic/type_adapter.py:366: in validate_python
    return self.validator.validate_python(object, strict=strict, from_attributes=from_attributes, context=context)
.venv/lib/python3.10/site-packages/nonebot/internal/adapter/message.py:166: in _validate
    value = [type_validate_python(cls.get_segment_class(), v) for v in value]
.venv/lib/python3.10/site-packages/nonebot/internal/adapter/message.py:166: in <listcomp>
    value = [type_validate_python(cls.get_segment_class(), v) for v in value]
.venv/lib/python3.10/site-packages/nonebot/compat.py:225: in type_validate_python
    return TypeAdapter(type_).validate_python(data)
.venv/lib/python3.10/site-packages/pydantic/type_adapter.py:135: in wrapped
    return func(self, *args, **kwargs)
.venv/lib/python3.10/site-packages/pydantic/type_adapter.py:366: in validate_python
    return self.validator.validate_python(object, strict=strict, from_attributes=from_attributes, context=context)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

cls = <class 'nonebot.adapters.qq.message.MessageSegment'>
value = {'data': {'text': 'test'}, 'type': 'text'}

    @classmethod
    def _validate(cls, value) -> Self:
        if isinstance(value, cls):
            return value
        if isinstance(value, MessageSegment):
            raise ValueError(f"Type {type(value)} can not be converted to {cls}")
        if not isinstance(value, dict):
            raise ValueError(f"Expected dict for MessageSegment, got {type(value)}")
        if "type" not in value:
            raise ValueError(
                f"Expected dict with 'type' for MessageSegment, got {value}"
            )
>       return cls(type=value["type"], data=value.get("data", {}))
E       TypeError: Can't instantiate abstract class MessageSegment with abstract method __str__

.venv/lib/python3.10/site-packages/nonebot/internal/adapter/message.py:76: TypeError

预期结果：
希望如下关系成立：

type_validate_python(Message, [{"type": "text", "data": {"text": "test"}}]) == Message(MessageSegment.text("test"))

[yanyongyu]

QQ 适配器的 MessageSegment 是 abstract class 所以是无法实例化的，需要使用子类型才行

[MeetWq]

QQ 适配器的 MessageSegment 是 abstract class 所以是无法实例化的，需要使用子类型才行

不能根据 type 实例化成对应的子类型吗？

[yanyongyu]

看了下似乎可以覆盖掉 segment 父类的 validate 方法来做到，不过这就是体力活了。

[MeetWq]

不太确定这个是否应该由适配器实现，还是让需要反序列化的插件自行实现？

[yanyongyu]

欢迎PR到适配器（