I'm having this issue as well, but in pydantic v2. It works fine in vanilla pydantic, but does not work with the CloudEvent -- or subclasses, as I am using.

In my specific case, I have a Generic subclass for our models.

import uuid
from typing import Generic, TypeVar

from cloudevents.pydantic.v2 import CloudEvent
from pydantic import BaseModel

T = TypeVar("T", bound=BaseModel)


class MyEntity(BaseModel):
    id: uuid.UUID


class MyCloudEvent(CloudEvent, Generic[T]):
    data: T


if __name__ == "__main__":
    obj = MyEntity(id=uuid.uuid4())

    evt = MyCloudEvent(
        id=str(uuid.uuid4()),
        source="urn:source",
        subject="subject",
        data=obj,
        event_type="MyEntity",
        type="xyz",
    )
    # This works:
    # print(evt.model_dump(mode="python"))

    # But this does not:
    print(evt.model_dump(mode="json"))

Stack trace snippet:

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/hans/Library/Application Support/JetBrains/PyCharm2023.2/scratches/scratch_42.py", line 30, in <module>
    print(evt.model_dump(mode="json"))
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hans/Library/Caches/pypoetry/virtualenvs/cvPU66vz-py3.11/lib/python3.11/site-packages/pydantic/main.py", line 308, in model_dump
    return self.__pydantic_serializer__.to_python(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pydantic_core._pydantic_core.PydanticSerializationError: Error calling function `_ce_json_dumps`: TypeError: Object of type MyEntity is not JSON serializable

nested pydantic cloudevent serialization doesn't work #198

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