option to set validators of pydantic model

[lucasbrahm]

Pydantic provides Before, After, Wrap and Plain validators, Field validators and Model validators. This is nice for cleaning and validating fields. For example, you can remove any non numeric characters for a phone field and then validate, like this:

class Register(BaseModel):
    phone: str

    @field_validator('phone')
    @classmethod
    def validate_phone(cls, v: str) -> str:
        new_phone = re.sub(r'\D', '', v)
        if len(new_phone) < 7:
            raise ValueError('Invalid phone number')
        return new_phone

So both phone '123-4567' and '1234567' will be validated and it will be stored as '1234567'.

The problem of tortoise "pydantic_model_creator" is that it exposes few options when calling pydantic "create_model". Also, tortoise field validators only validate data, without modifying/cleaning data.

Fortunately, you can add validators in pyndatic by passing a dict to the "validators" argument when calling "create_model".

The idea of this PR is to add "validators" option in tortoise "pydantic_model_creator" which will be used during the call of pydantic "create_model"

So in the end it would be like this:

class Register(models.Model):
    phone = fields.CharField(max_length=20)

def validate_phone(v: str) -> str:
    new_phone = re.sub(r'\D', '', v)
    if len(new_phone) < 7:
        raise ValueError('Invalid phone number')
    return new_phone

validators = {
    'phone_validator': field_validator('phone')(validate_phone)
}

Register_Pydantic = pydantic_model_creator(Register, name="Register", __validators__=validators)

[long2ice]

Also please update changlog.

[lucasbrahm]

Made the adjustments. Also updated the docstring. Not sure how to add it to the changelog

[long2ice]

Just ref CHANGELOG.rst

[lucasbrahm]

Is it ok?

[long2ice]

Thanks!

[coveralls]

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