pydantic_field_validator_decorator_string_character_validation.py

1from pydantic import BaseModel, field_validator
2
3
4class UserModel(BaseModel):
5    name: str
6
7    @field_validator('name')
8    @classmethod
9    def name_must_contain_space(cls, v: str) -> str:
10        if ' ' not in v:
11            raise ValueError('must contain a space')
12        return v.title()
13
14
15print(UserModel(name='Jane Doe'))
16#> name='Jane Doe'