from pydantic import BaseModel, field_validator, model_validator
[docs]class ExampleValidators(BaseModel):
"""Show usage of asterisk and root validators.
"""
name: str
email: str
[docs] @field_validator("*")
def check_non_whitespaces(cls, v):
"""Confirm that string contains non whitespace characters.
"""
stripped = v.strip()
if stripped:
return v
else:
raise ValueError("String contains only whitespace characters.")
[docs] @model_validator(mode="after")
def check_contains_letters(cls, values):
"""Confirm that string contains at least one letter.
"""
for key, value in values.items():
has_letter = any(x.isalpha() for x in value)
if not has_letter:
raise ValueError(f"Field '{key}' does not contain a letter.")
return values