Hypothesis plugin not working with alias and special characters

[galbino]

Initial Checks

• I have searched GitHub for a duplicate issue and I'm sure this is something new
• I have searched Google & StackOverflow for a solution and couldn't find anything
• I have read and followed the docs and still think this is a bug
• I am confident that the issue is with pydantic (not my code, or another library in the ecosystem like FastAPI or mypy)

Description

Hi, I have a schema that uses an alias containing $ within its name and it seems that, on that case, hypothesis can't generate input values for it and it raises the following error:

>   ???
E   pydantic.error_wrappers.ValidationError: 1 validation error for ExampleSchemaBad
E   $example
E     field required (type=value_error.missing)

pydantic/main.py:342: ValidationError

FAILED tests/unit/test_pylint.py::test_dollar_sign - pydantic.error_wrappers.ValidationError: 1 validation error for ExampleSchemaBad

Apparently the issue isn't only with the dollar sign, but with all special characters

Example Code

import hypothesis
import pydantic
from hypothesis import strategies as st


class ExampleSchemaBad(pydantic.BaseModel):
    example: str = pydantic.Field(alias="$example")


class ExampleSchemaGood(pydantic.BaseModel):
    example: str = pydantic.Field(alias="other")


@hypothesis.given(
    request=st.builds(
        ExampleSchemaBad,
    )
)
def test_dollar_sign(
    request: ExampleSchemaBad,
) -> None:
    pass


@hypothesis.given(request=st.builds(ExampleSchemaGood))
def test_clean(
    request: ExampleSchemaGood,
) -> None:
    pass

Python, Pydantic & OS Version

pydantic version: 1.10.4
            pydantic compiled: True
               python version: 3.10.5 (main, Oct  3 2022, 09:43:47) [Clang 13.1.6 (clang-1316.0.21.2.5)]
                     platform: macOS-13.2-arm64-arm-64bit
     optional deps. installed: ['typing-extensions']

Affected Components

• Compatibility between releases
• Data validation/parsing
• Data serialization - .model_dump() and .model_dump_json()
• JSON Schema
• Dataclasses
• Model Config
• Field Types - adding or changing a particular data type
• Function validation decorator
• Generic Models
• Other Model behaviour - model_construct(), pickling, private attributes, ORM mode
• Plugins and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.

[galbino]

As a possible workaround, for some of you that might be facing the same issue, something like:
@hypothesis.given(st.builds(ExampleSchemaBad, **{"$example": st.text()}))
seems to work.

[hramezani]

Hi @galbino,

Thanks for reporting the issue and for the workaround.

I can confirm the problem. I think it can't get a fix in v1.
@samuelcolvin Do you have any idea how to fix the problem? or even do we want to fix it in V2?

[sydney-runkle]

We’re no longer actively developing Pydantic V1 (although it will continue to receive security fixes for the next year or so), so we’re closing issues solely related to V1. If you really think this shouldn’t be closed, please comment or create a new issue 🚀.