Pydantic model not detected by RUF012

[cbornet]

• List of keywords you searched for before creating this issue: pydantic ruf012
• The current Ruff version : 0.5.0

RUF012 normally ignores pydantic models but not when the class inherits from an imported model.
Eg: file b.py

from pydantic import BaseModel

class B(BaseModel):
    pass

file a.py

from pydantic import BaseModel
from b import B

class Foo(B):
    foo: list[str] = []

class C(BaseModel):
    pass

class Bar(C):
    bar: list[str] = []

Then run ruff

ruff check --select RUF012
a.py:5:22: RUF012 Mutable class attributes should be annotated with `typing.ClassVar`
  |
4 | class Foo(B):
5 |     foo: list[str] = []
  |                      ^^ RUF012
6 |
7 | class C(BaseModel):
  |

Found 1 error.

I would expect ruff to not error.

[zanieb]

Ruff doesn't support multi-file analysis yet, we can't inspect the type across the import boundary

xref #7447

[cbornet]

Thanks for the info. I'll follow #7447 with interest then.

[zanieb]

We're actively working on it, but it's a ways out.