Pydantic不知道如何将每个关系ORM示例Map到其地址字段。为此，您需要添加一个pydantic验证器，并使用pre=True参数，以便将每个ORM示例Map到地址字段 before pydantic validation。
下面是它应该是什么样子

class IpSchema(BaseModel):
    ip_address: List[Union[IPv4Address, IPv6Address, IPvAnyAddress]] = Field()

    class Config:
        orm_mode = True

    @validator('ip_address', pre=True)
    def validate(cls, ip_adress_relationship, **kwargs):
        return [ip.address for ip in ip_adress_relationship]

请注意，带有pre=True的验证器在将值设置为Pydantic模型之前和之后运行。在你的例子中，它没有改变任何东西，但是，例如，如果你想将IP列表转换为str，你需要首先检查值的类型：

class IpSchema(BaseModel):
    ip_address: str

    class Config:
        orm_mode = True

    @validator('ip_address', pre=True)
    def validate(cls, ip_adress_relationship, **kwargs):
        if isinstance(ip_adress_relationship, str):
            return ip_adress_relationship
        return ','.join([ip.address for ip in ip_adress_relationship])

下面是整个可重复的（和工作的）示例：

from typing import List, Union

from pydantic import BaseModel, Field, IPvAnyAddress
from pydantic import validator
from pydantic.schema import IPv4Address
from pydantic.schema import IPv6Address
from sqlalchemy import INTEGER, Column, ForeignKey, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship

Base = declarative_base()

class IpModel(Base):
    __tablename__ = "ip_model"

    id = Column(INTEGER, primary_key=True, autoincrement=True, index=True)
    ip_address = relationship("IpAddress", back_populates="ip_model")

class IpAddress(Base):
    __tablename__ = "ip"

    id = Column(INTEGER, primary_key=True, autoincrement=True, index=True)
    address = Column(String(64), nullable=False)

    ip_model_id = Column(INTEGER, ForeignKey("ip_model.id"), nullable=False)
    ip_model = relationship("IpModel", back_populates="ip_address")

class IpSchema(BaseModel):
    ip_address: List[Union[IPv4Address, IPv6Address, IPvAnyAddress]] = Field()

    class Config:
        orm_mode = True

    @validator('ip_address', pre=True)
    def validate(cls, ip_adress_relationship, **kwargs):
        return [ip.address for ip in ip_adress_relationship]

def test_ipv4():
    ipv4: str = "192.168.1.1"

    ip = IpAddress(address=ipv4)
    m = IpModel(ip_address=[ip])
    s = IpSchema.from_orm(m)

    assert str(s.ip_address[0]) == ipv4
if __name__ == '__main__':
    test_ipv4()