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我是石墨烯的新手

我正在尝试从 3 个模型接收信息：两个模型连接（用户和类）具有多对多关系，一个模型（课程）与类模型多对一连接。

我的目标是有可能在用户数据之后将有关 Class 模型的信息显示为 Class 内的列表。但我只能显示数据 beetwen 用户和类。但需要列出所有数据用户 -> 课程 -> 课程。冷了怎么办？

这里它必须看起来

我的模型是：

table = Table('table', Base.metadata,
    Column('left', Integer, ForeignKey('left.id')),
    Column('right', Integer, ForeignKey('right.id'))
)

class User(Base):
    __tablename__ = 'right'
    id = Column(Integer, primary_key=True)
    name = Column(String(255))
    lessons = relationship("Class",
                    secondary=table,
                    backref="user")

class Classes(Base):
    __tablename__ = 'left'
    id = Column(Integer, primary_key=True)
    name = Column(String(255))
    lessons = relationship('User', backref='classes')



class Lessons(Base):
    __tablename__ = 'lessons'
    id = Column(Integer, primary_key=True)
    name = Column(String(255))
    class_id= Column(Integer, ForeignKey('class.id'))

我的模式和查询是：

class UserSchema(SQLAlchemyObjectType):
    class Meta:
        model = User
        interfaces = (relay.Node, )


class ClassesSchema(SQLAlchemyObjectType):
    class Meta:
        model = Contract
        interfaces = (relay.Node, )

class LessonsSchema(SQLAlchemyObjectType):
    class Meta:
        model = Plan
        interfaces = (relay.Node,)


class Query(graphene.ObjectType):
    node = relay.Node.Field()
    # Allows sorting over multiple columns, by default over the primary key
    all = SQLAlchemyConnectionField(UserSchema)
    # Disable sorting over this field
    all_classes = SQLAlchemyConnectionField(ClassesSchema)

    all_lessons = SQLAlchemyConnectionField(LessonsSchema)

schema = graphene.Schema(query=Query)

输出割草是：

{
  "data": {
    "all": {
      "edges": [
        {
          "node": {
            "id": "TWFpbmNoZW1hOjE=",
            "name": "User 1",
            "Classes": {
              "edges": [
                {
                  "node": {
                    "id": "Q29udHJhY3RTY2hlbWE6Mg==",
                    "name": "First class",
                    "lessons": {
                      "edges": []
                    }
                  }
                }
              ]
            }
          }
        },

主要问题是课程列表是空的，但是如果我查询课程它会显示信息，并且它不是空的。

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0 回答 0