mypy fails to typecheck inherited model with a field alias #11009
Description
Initial Checks
- I confirm that I'm using Pydantic V2
Description
When a model:
- Inherits another model
- Overrides a field
- Sets an alias for it
mypy fails to typecheck the result complaining about __replace__ taking the aliased field name but not the original field name.
I have found this issue updating a project for Python 3.13, there might be other issues with replace functionality but I'll open them separately.
Example Code
from pydantic import BaseModel, Field
class One(BaseModel):
foo: str
class Two(One):
foo: str = Field(..., alias="bar")
# Signature of "__replace__" incompatible with supertype "One" [override]
# Superclass:
# def __replace__(*, <SNIP>, foo: str = ...) -> One
# Subclass:
# def __replace__(*, <SNIP>, bar: str = ...) -> TwoPython, Pydantic & OS Version
pydantic version: 2.10.2
pydantic-core version: 2.27.1
pydantic-core build: profile=release pgo=false
install path: /home/alex/.cache/pypoetry/virtualenvs/mybox-YUnsYrZx-py3.13/lib/python3.13/site-packages/pydantic
python version: 3.13.0 (main, Oct 8 2024, 00:00:00) [GCC 14.2.1 20240912 (Red Hat 14.2.1-3)]
platform: Linux-6.11.8-300.fc41.x86_64-x86_64-with-glibc2.40
related packages: mypy-1.13.0 typing_extensions-4.12.2
commit: unknown