Signature of dataclass does not support field name alias which is defined with std-dataclass field metadata

[shinaji]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

Hello, I found that the signature of dataclass does not support field name alias which is defined with std-dataclass field metadata, even though the "ge" and so on validations are supported. Is this expected behavior at pydantic v2?

Example Code

from dataclasses import field
from pydantic.dataclasses import dataclass, Field

@dataclass
class A:
    a: int = field(metadata={"ge": 1, "alias": "aa"}) 

# In [3]: A.__signature__
# Out[3]: <Signature (a: int) -> None>  # This should be "<Signature (aa: int) -> None>"

# The "ge" validation is supported
# In [4]: A(aa=0)
# ValidationError: 1 validation error for A
# aa
#  Input should be greater than or equal to 1 [type=greater_than_equal, input_value=0, input_type=int]
#    For further information visit https://errors.pydantic.dev/2.5/v/greater_than_equal

Python, Pydantic & OS Version

pydantic version: 2.5.2
        pydantic-core version: 2.14.5
          pydantic-core build: profile=release pgo=false
               python version: 3.9.13 (main, Sep 17 2022, 22:53:18)  [Clang 14.0.0 (clang-1400.0.29.102)]
                     platform: macOS-13.6-arm64-arm-64bit
             related packages: email-validator-2.0.0.post2 fastapi-0.105.0 pydantic-extra-types-2.1.0 mypy-1.3.0 typing_extensions-4.8.0 pydantic-settings-2.0.3

[sydney-runkle]

@shinaji,

Thanks for reporting. Looks like a bug! Any interest in taking a crack at a fix?

[NeevCohen]

Hey @sydney-runkle, I can try to give this a shot.

[NeevCohen]

@sydney-runkle I opened a PR

[sydney-runkle]

@sydney-runkle I opened a PR

Fantastic! I'll review later today :)