如何在 Pydantic 中重用 root_validator？

Question

Pydantic 文档有一个重用验证器的示例： https:
//pydantic-docs.helpmanual.io/usage/validators/#reuse-validators

是否可以重用根验证器？

Answer 1

是的，这是可能的，并且 API 非常相似

例子：

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
    )

也可以像本例中那样参数化验证器https://github.com/samuelcolvin/pydantic/discussions/2938