model_validate fails to work correctly under multiple inheritance #12229
Description
Initial Checks
- I confirm that I'm using Pydantic V2
Description
code is at the below, my question it not work.
x = Xxx.model_validate(dict(quantity=10, xxx="m"))
assert x.unit == "m"Example Code
from pydantic import BaseModel
import pytest
class QuantifiedValue(BaseModel):
unit: int
quantity: int
class OverideQuantifiedValue(QuantifiedValue):
unit: str = Field(validation_alias=AliasChoices("xxx"))
class Xxx(OverideQuantifiedValue):
pass
Yyy = OverideQuantifiedValue
def test_override_quantified_value():
x = OverideQuantifiedValue.model_validate(dict(quantity=10, xxx="m"))
assert x.unit == "m"
with pytest.raises(AssertionError):
x = Xxx.model_validate(dict(quantity=10, xxx="m"))
assert x.unit == "m"
y = Yyy.model_validate(dict(quantity=10, xxx="m"))
assert y.unit == "m"Python, Pydantic & OS Version
pydantic version: 2.11.7
pydantic-core version: 2.33.2
pydantic-core build: profile=release pgo=false
python version: 3.13.5 | packaged by Anaconda, Inc. | (main, Jun 12 2025, 16:37:03) [MSC v.1929 64 bit (AMD64)]
platform: Windows-11-10.0.26100-SP0
related packages: typing_extensions-4.14.0 typing_extensions-4.14.1
commit: unknown