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我正在将 fastapi 与 tortoise orm 一起使用，当我想添加购物车时出现此错误

错误

如果值而不是值。_saved_in_db：AttributeError：'int'对象没有属性'_saved_in_db'

楷模

class Cart(BaseModel):
    user = fields.ForeignKeyField('models.User', related_name='user_cart')
    product = fields.ForeignKeyField(
        'models.Product', related_name='product_cart')
    quantity = fields.IntField(default=0)

    class Meta:
        table = 'carts'
        ordering = ('-created',)

图式

class CartCreate(BaseModel):
    product_id: int
    quantity: int = Field(..., ge=0, le=10)


class Cart(BaseModel):
    id: int

    class Config:
        orm_mode = True

路线

@router.post('/create', status_code=status.HTTP_201_CREATED)
async def create_cart(
    cart: CartCreate, 
    user: User = Depends(get_current_user)
) -> CartSchema:
    cart_obj = await Cart.create(
        user=user.id,
        product=cart.product_id,
        quantity=cart.quantity
    )
    return CartSchema.from_orm(cart_obj)

我应该怎么办？

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