[BUG] Pydantic's StringConstraint not working as expected in SQLModel

[mubarakalmehairbi]

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Example Code

from pydantic import BaseModel
from sqlmodel import SQLModel, Field
from typing_extensions import Annotated
from pydantic.types import StringConstraints

UsernameStr = Annotated[str, StringConstraints(strip_whitespace=True, to_lower=True)]

class NormalModel(BaseModel):
    username: UsernameStr

class SqlModel(SQLModel, table=True):
    id: str = Field(primary_key=True)
    username: UsernameStr

print(f"Normal: {NormalModel(username='ABC')}")
print(f"Sql: {SqlModel(username='ABC')}")

Description

The expected output is:

Normal: username='abc'
Sql: username='abc'

where in both cases the username is in lower case.

However, the output is:

Normal: username='abc'
Sql: username='ABC'

Notice that pydantic converted the username to lower case while sqlmodel didnt.
Note that this only happens if table=True.

Operating System

Windows

Operating System Details

No response

SQLModel Version

0.0.24

Python Version

3.10.0

Additional Context

No response