Support for pydantic v2

[gaborbernat]

https://github.com/cloudevents/sdk-python/blob/main/cloudevents/pydantic/event.py#L87

https://docs.pydantic.dev/latest/migration/

[xSAVIKx]

Hey @gaborbernat, thx for pointing this out. Is there any info on how one may support both v1 and v2 of Pydantic? While switching to v2 completely will break things for the library users.

[gaborbernat]

I don't think there's support for supporting both... You could do some gimnastics to switch implementation based on detected version 🤷‍♂️ but will get messy.

[febus982]

The main problem could be testing but the pydantic V2 implementation includes the old V1, namespaced in the pydantic.v1 module.

It looks horrible but importing the BaseModel like this might work:

pydantic_version = pydantic.version.VERSION.split('.')[0]

from pydantic import BaseModel as BaseModelV2
if pydantic_version == '1'
    from pydantic BaseModel as BaseModelV1
else
    from pydantic.v1 BaseModel as BaseModelV1

class _CloudEventBaseV1(BaseModelV1):
   # Existing implementation

class _CloudEventBaseV2(BaseModelV2):
   # Pydantic V2 configured model
   
if pydantic_version == '1':
    CloudEvent = _CloudEventBaseV1
else:
    CloudEvent = _CloudEventBaseV2

It looks horrible, I know.