[BUG] Pydantic Flytekit plugin is not compatible with Pydantic v2

[adartaud]

Describe the bug

Since Pydantic v2, the method __get_validators__ has been removed from pydantic.BaseModel. However as you can see here flytekitplugins-pydantic still uses it.
This raises AttributeError: __get_validators__

Expected behavior

At the moment, there are no constraints on the version of Pydantic in the setup.py of the plugin, although it only seems to be compatible with versions prior to v2.
flytekitplugins-pydantic should be compatible with new versions of Pydantic, or at least specify a constraint while this isn't fixed.

Additional context to reproduce

No response

Screenshots

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[welcome]

Thank you for opening your first issue here! 🛠

[dosubot]

🤖

It's great to see your interest in improving the compatibility of flytekit with Pydantic v2. Your understanding of the issue and the proposed solution are valuable contributions. Encouraging users like you to take the initiative to create a PR is what helps open-source projects like flyte grow and improve. Keep up the good work, and I hope to see your contribution to flyte soon!

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[eapolinario]

@adartaud , thanks for the report!

We raised a concern about pydantic v2 in flyteorg/flytekit#1660, but it looks like at the time pydantic v2 could be supported. We should validate and increase test coverage if possible.

@adartaud , do you have a repro?

Also, feel free to open a PR to pin the version.

[adartaud]

Thanks for your reply.
I tested again with up-to-date versions and I still encounter the issue.

Here is a repro:

1. Create and activate a new virtual env (python -m venv env & source env/bin/activate)
2. Install these dependencies with pip install -r requirements.txt

# requirements.txt
flytekit==1.10.2
flytekitplugins-pydantic==1.10.2
pydantic==2.5.2

3. Run a python shell and simply try to run import flytekit. This will raise AttributeError: __get_validators__

[davidmirror-ops]

@adartaud I can repro the behavior you describe here. Nevertheless, when I use the recent flytekitplugins-pydantic-1.11.0 then it works, following the example described in 2217

Can you verify and confirm if it works for you?