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我正在为烧瓶和反应应用程序使用Brian Cappello入门套件。我正在尝试在两个模型之间创建关系，并希望加载相关数据作为对前端的响应。

下面是两个类模型

class UserChatRoom(Model):
sender_id = foreign_key('User')
sender = relationship('User')
listing_id = foreign_key('Listing')
listing = relationship('Listing')

class User(Model, UserMixin):
email = Column(String(50), unique=True, index=True)
name = Column(String(256))
password = Column(String, nullable=True)
pic = Column(String, nullable=True)
active = Column(Boolean(name='active'), default=False)
confirmed_at = Column(DateTime(), nullable=True)
mobile = Column(String(13), unique=True, nullable=False)
is_mobile_verified = Column(Boolean(), default=False)
user_roles = relationship('UserRole', back_populates='user',
                          cascade='all, delete-orphan')
roles = association_proxy('user_roles', 'role',
                          creator=lambda role: UserRole(role=role))
buyerDetails = Column(JSON, default={}, nullable=True)
sellerDetails = Column(JSON, default={}, nullable=True)
__repr_props__ = ('id', 'email', 'name', 'mobile', 'active')

下面是我的 UserChatRoom 类序列化程序

USER_CHAT_ROOM_FIELDS = (
"id",
"created_at",
"updated_at",
"listing_id",
"sender_id")


class UserChatRoomSerializer(ModelSerializer):
sender = fields.Nested("UserSerializer", only='name',
                       dump_only=True)

class Meta:
    model = UserChatRoom
    fields = USER_CHAT_ROOM_FIELDS


@api.serializer(many=True)
class UserChatRoomListSerializer(UserChatRoomSerializer):
    class Meta:
      model = UserChatRoom
      fields = USER_CHAT_ROOM_FIELDS

这种关系基本上是用户拥有一个给定列表的聊天室。当我查询 UserChatRoom 表时，我需要以下响应。

"data": [
    {
        "created_at": "2021-08-30T11:47:54.992658+00:00",
        "id": 3,
        "listing_id": 37,
        "sender_id": 27,
        "sender": {
              "name" : "xxyyyzzz"
        },
        "updated_at": "2021-08-30T11:47:54.992658+00:00"
    }
],

但我得到这个输出

"data": [
    {
        "created_at": "2021-08-30T11:47:54.992658+00:00",
        "id": 3,
        "listing_id": 37,
        "sender_id": 27,
        "updated_at": "2021-08-30T11:47:54.992658+00:00"
    }
],

使用的查询：

user_list = UserChatRoom.filter_by(
        listing_id=listing_id).all()

当我使用 .first() 时，我可以通过 usr_list.sender 加载发件人详细信息，但对于 .all() 它没有填充

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