Model with custom root type fails if in a nested model

[NixBiks]

I'm not sure if this is a bug or not but it feels like a bug to me. Here is the example where the last line causes a ValidationError since __root__ keyword is not specifically provided.

from pydantic import BaseModel
from typing import Union, List


class A(BaseModel):
    name: str

class B(BaseModel):
    pipeline: List["Component"]

class Component(BaseModel):
    __root__: Union[A, B]

B.update_forward_refs(Component=Component)


Component.parse_obj({"name": "John Doe"})  # passes
Component.parse_obj({"pipeline": [{"__root__": {"name": "John Doe"}}]})  # passes

Component.parse_obj({"pipeline": [{"name": "John Doe"}]})  # fails

[NixBiks]

Actually now that I look at it, it sorta makes sense. I still wonder how to achieve my goal here in the best and most simple way.

[PrettyWood]

I thought I fixed this in v1.8 🤔 Which version do you use please?

[NixBiks]

I thought I was on v1.8 but it was v1.7. It works as expected in v1.8 - thanks!

Side note: apparently poetry update pydantic@latest does not work as expected