feat: fix dump one of fields

[aymen-k]

Summary

Hey 👋
I generated code with pydantic validation.
A nested class failed the validation. For some reason, the object is validated twice once with the initialized object and once with empty fields.

    @model_validator(mode="after")
    def check_oneof(cls, values):
        return cls._validate_field_groups(values)

Switching the order of the condition made it possible to avoid the second 'extra' validation.

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
  • This change has an associated test.
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[Gobot1234]

Hi there, what does this fix? Please can you add a regression test

[aymen-k]

Hi @Gobot1234, just added description to the PR