The Pydantic docs have an example of reusing a validator:
https://pydantic-docs.helpmanual.io/usage/validators/#reuse-validators
Is it possible to reuse a root validator?
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Answer
Yes, it is possible and the API is very similiar
Example:
from datetime import datetime from pydantic import BaseModel, validator from pydantic.class_validators import root_validator def validate_start_time_before_end_time(cls, values): """ Reusable validator for pydantic models """ if values["start_time"] >= values["end_time"]: raise ValueError("start_time must be before end_time") return values class Model1(BaseModel): start_time: datetime end_time: datetime # validators _datetime_order_validation = root_validator(allow_reuse=True)( validate_start_time_before_end_time ) class Model2(BaseModel): start_time: datetime end_time: datetime # validators _datetime_order_validation = root_validator(allow_reuse=True)( validate_start_time_before_end_time )
It is also possible to parameterize the validator like in this example https://github.com/samuelcolvin/pydantic/discussions/2938