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?
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
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