class Address(Base):
    event_id: Mapped[int] = mapped_column(
        sa.Integer,
        sa.ForeignKey('events.id'),
        nullable=False
    )
    event = relationship(
        'Event',
        back_populates='address',
        uselist=False
    )

class Event(Base):
    address = relationship(
        'Address',
        uselist=False,
        back_populates='event',
    )

class AddressSchema(BaseModel):
    country: str
    city: str
    street: str
    build: str
class EventSchema(BaseModel):
    address: Optional[AddressSchema] = Field(...)

{"id": 1, "address": {"country": "foocountry", "street": "foostreet"}
</details>
# 答案1
**得分**: 0
解决方案是为AdressSchema添加`orm_mode = True`。
<details>
<summary>英文:</summary>
The solution was to add an `orm_mode = True` for AdressSchema
</details>
# 答案2
**得分**: 0
你的`Address`模型没有像国家、城市等字段。请更新你的模型和架构：
```python
import sqlalchemy as sa
import sqlalchemy.orm as so
class Event(Base):
    address_id: so.Mapped[int] = so.mapped_column(
        sa.ForeignKey("address.id", ondelete="SET NULL"), nullable=True
    )
    address: so.Mapped[Address] = so.relationship(
        back_populates='event', lazy="selectin"
    )

class EventSchema(BaseModel):
    address: Optional[AddressSchema] = None
    class Config:
        orm_mode = True