Use Pydantic V2 models

[develop-cs]

Is your feature request related to a problem? Please describe

Use Pydantic V2 BaseModel class rather than V1 (maintenance purpose only).

Describe the solution you'd like

Migrate referring the Pydantic V2 Migration Guide.

Describe alternatives you've considered

Use Pydantic V2/V1 backward compatibility:

try:
    from pydantic import v1 as pydantic
except ImportError:
    import pydantic  # type: ignore

[roman2git]

Hello,
what is the goal here? should final code match requirements for both pydantic v1 and v2 or switch to v2 completely (impacting dependencies)?

[develop-cs]

Hi,
Good question. Answer is the first:

"final code match requirements for both pydantic v1 and v2"

Currently, we are using Pydantic v2's backward compatibility of v1:

arta/src/arta/models.py

Lines 8 to 11 in b7b8938

	try:
	from pydantic import v1 as pydantic
	except ImportError:
	import pydantic # type: ignore

The goal here is to implement the Pydantic models using Pydantic v2 but still compatible with v1.

A first idea (inspired by FastAPI) but not tested could be something like (code is an example):

from pydantic import BaseModel
from pydantic.version import VERSION

PYDANTIC_V1: bool = VERSION.startswith("1.")

if PYDANTIC_V1:

    class MyModel(BaseModel):

        attr_1: str

        class Config:
            extra = "allow"

else:
    from pydantic import ConfigDict

    class MyModel(BaseModel):

        attr_1: str

        model_config = ConfigDict(extra="allow")

[roman2git]

Hello, thanks for explaining
I'll try to implement it.
And yes, probably, there will be a lot of ugly if..else here and there