For Form data, I defined class as mentioned here /a/60670614/6189499. Using pydantic v2, pydantic model is defined as

@as_form
class Test(BaseModel):
    param1: str
    c: bool = False
    
    @field_validator('c',mode='before')
    @classmethod
    def convert_to_bool(cls, v):
        print("hello inside bool")
        if isinstance(v, str):
            if v.lower() in {'true', 'True'}:
                return True
            elif v.lower() in {'false', 'False'}:
                return False
        return v

from fastapi import Depends, Form
@router.post('/me')
async def me(request: Request, form: Test = Depends(Test.as_form)):
    return form

Sending formdata, ‘c’ from basemodel is always string and field_validation is not executed. How to casting that string value ‘c’ to boolean?

I tried this

@as_form
class Test(BaseModel):
    param1: str
    c: string= "False"

    @field_validator('c',mode='before')
    @classmethod
    def convert_to_bool(cls, v):
        print("hello inside bool")
        if isinstance(v, str):
            if v.lower() in {'true', 'True'}:
                return True
            elif v.lower() in {'false', 'False'}:
                return False
        return v

This also doesn’t execute validation check.