如何使用1：1连接创建解析器

Question

我需要加入（1：1）2个模型并将其解析为graphql。

为PartsList和Items定义的模型：

const Item = sequelize.define('Item', {
      id: {
        type: DataTypes.INTEGER,
        primaryKey: true,
        autoIncrement: true
      },
      itemNumber: {
        type: DataTypes.TEXT,
        allowNull: false
      },
      title: {
        type: DataTypes.TEXT,
        allowNull: false,
      },
      description: {
        type: DataTypes.TEXT,
        allowNull: true
      },
      stock: {
        type: DataTypes.INTEGER,
        allowNull: false
      },
    },
  );

  const PartsList = sequelize.define('PartsList', {
      id: {
        type: DataTypes.INTEGER,
        primaryKey: true,
        autoIncrement: true
      },
      parentId: {
        type: DataTypes.INTEGER,
        allowNull: true
      },
      itemNo: {
        type: DataTypes.INTEGER,
        allowNull: false
      },
      quantity: {
        type: DataTypes.INTEGER,
        allowNull: false
      },
      itemId: {
        type: DataTypes.INTEGER,
      }
    },
  );

  PartsList.associate = (models) => {
    PartsList.belongsTo(models.Item, { as: 'item'});
  }

零件列表的项目模式：

const typeDefs  = gql`
  type Item {
    id: ID!
    itemNumber: String!
    title: String!
    description: String
    stock: Int!

  }
  extend type Query {
    item(id: ID!): Item
    itemNo(itemNumber: String!): Item
    items: [Item!]!
  }
  extend type Mutation {
    createItem(input: ItemInput!): Item!
    updateItem(input: ItemInput!): Item!
    deleteItem(input: ItemInput!): Item!
  }
`;

const typeDefs  = gql`
  type PartsList {
    id: ID!
    parentId: Int
    itemNo: Int!
    quantity: Int!
    itemId: Item
  }

  extend type Query {
    partsList(id: ID!): PartsList
    partsLists: [PartsList!]!
  }

`;

以下SQL查询满足了我的请求：

选择p.id，p.parentId，p.itemNo，p.quantity，i.itemNumber，i.title来自PartsList AS p加入项目AS i ON p.itemId = i.id;

id  parentId    itemNo  quantity    itemNumber  title
2   NULL        1       1           512526      Item A
3   2           1       1           123456      Item B
4   2           1       2           234567      Item C

我正在寻找查询和解析器

query {
  xyz {
    id          // from partsList
    parentId    // from partsList
    itemNo      // from partsList
    quantity    // from partsList   
    itemNumber  // from Item
    description // from Item
  }
}

获得所需的结果

{
  "data":{
    "partsList":[
      {
        "id": "2",              // from partsList
        "parentId": null,       // from partsList
        "itemNo": "1",          // from partsList
        "quantity": "1",        // from partsList
        "itemNumber": "512526", // from Item
        "description": "Item A",// from Item
      },
      {
        ...
      },
      {
        ...
      }
    ]
  }
}

感谢帮助