AWS Appsync图形AWS

Question

最近对Appsync Graphql转换器进行了更改，我一直试图相应地迁移代码，但每次都会失败。

我在youtube上学习一个简单的教程，解释如何构建一个实时聊天应用程序。视频中的家伙使用Appsync和Graphql一起开发他的后端，但是正在用V1转换器进行开发。

我试着阅读文档并确实修改了我的代码，但它似乎并没有按照我所希望的方式工作。

的代码

type User @model {
  id: ID!
  name: String!
  imageUri: String
  status: String
  chatRoomUser: [ChatRoomUser] @connection(keyName: "byUser", fields: ["id"])
}

type ChatRoomUser
@model
@key(name: "byUser", fields: ["userID", "chatRoomID"])
@key(name: "byChatRoom", fields: ["chatRoomID", "userID"]) {
  id: ID!
  userID: ID!
  chatRoomID: ID!
  user: User @connection(fields: ["userID"])
  chatRoom: ChatRoom @connection(fields: ["chatRoomID"])
}

type ChatRoom @model {
  id: ID!
  chatRoomUsers: [ChatRoomUser] @connection(keyName: "byChatRoom", fields: ["id"])
}

我的代码

type User @model {
  id: ID!
  name: String!
  imageUri: String
  status: String
  chatRoomUser: [ChatRoomUser] @hasMany
}

type ChatRoomUser @model {
  id: ID! @primaryKey
  userID: ID! @index(name: "byUser", sortKeyFields: ["chatRoomID"])
  chatRoomID: ID! @index(name: "byChatRoom", sortKeyFields: ["userID"])
  user: User @belongsTo(fields: ["userID"])
  chatRoom: ChatRoom @belongsTo(fields: ["chatRoomID"]
}

type ChatRoom @model {
  id: ID!
  chatRoomUsers: [ChatRoomUser] @hasMany
}

这些是他用Aws查询的结果。

​

​

这些是我的查询结果

​

​

这是我自动生成的queries.js文件。

/* eslint-disable */
// this is an auto generated file. This will be overwritten

export const getUser = /* GraphQL */ `
  query GetUser($id: ID!) {
    getUser(id: $id) {
      id
      name
      imageUri
      status
      chatRoomUser {
        items {
          id
          userID
          chatRoomID
          createdAt
          updatedAt
          userChatRoomUserId
          chatRoomChatRoomUsersId
        }
        nextToken
      }
      createdAt
      updatedAt
    }
  }
`;
export const listUsers = /* GraphQL */ `
  query ListUsers(
    $filter: ModelUserFilterInput
    $limit: Int
    $nextToken: String
  ) {
    listUsers(filter: $filter, limit: $limit, nextToken: $nextToken) {
      items {
        id
        name
        imageUri
        status
        chatRoomUser {
          nextToken
        }
        createdAt
        updatedAt
      }
      nextToken
    }
  }
`;
export const getChatRoomUser = /* GraphQL */ `
  query GetChatRoomUser($id: ID!) {
    getChatRoomUser(id: $id) {
      id
      userID
      chatRoomID
      user {
        id
        name
        imageUri
        status
        chatRoomUser {
          nextToken
        }
        createdAt
        updatedAt
      }
      chatRoom {
        id
        chatRoomUsers {
          nextToken
        }
        createdAt
        updatedAt
      }
      createdAt
      updatedAt
      userChatRoomUserId
      chatRoomChatRoomUsersId
    }
  }
`;
export const listChatRoomUsers = /* GraphQL */ `
  query ListChatRoomUsers(
    $id: ID
    $filter: ModelChatRoomUserFilterInput
    $limit: Int
    $nextToken: String
    $sortDirection: ModelSortDirection
  ) {
    listChatRoomUsers(
      id: $id
      filter: $filter
      limit: $limit
      nextToken: $nextToken
      sortDirection: $sortDirection
    ) {
      items {
        id
        userID
        chatRoomID
        user {
          id
          name
          imageUri
          status
          createdAt
          updatedAt
        }
        chatRoom {
          id
          createdAt
          updatedAt
        }
        createdAt
        updatedAt
        userChatRoomUserId
        chatRoomChatRoomUsersId
      }
      nextToken
    }
  }
`;
export const getChatRoom = /* GraphQL */ `
  query GetChatRoom($id: ID!) {
    getChatRoom(id: $id) {
      id
      chatRoomUsers {
        items {
          id
          userID
          chatRoomID
          createdAt
          updatedAt
          userChatRoomUserId
          chatRoomChatRoomUsersId
        }
        nextToken
      }
      createdAt
      updatedAt
    }
  }
`;
export const listChatRooms = /* GraphQL */ `
  query ListChatRooms(
    $filter: ModelChatRoomFilterInput
    $limit: Int
    $nextToken: String
  ) {
    listChatRooms(filter: $filter, limit: $limit, nextToken: $nextToken) {
      items {
        id
        chatRoomUsers {
          nextToken
        }
        createdAt
        updatedAt
      }
      nextToken
    }
  }
`;

这是他自动生成的queries.js文件。

/* tslint:disable */
/* eslint-disable */
// this is an auto generated file. This will be overwritten

export const getUser = /* GraphQL */ `
  query GetUser($id: ID!) {
    getUser(id: $id) {
      id
      name
      imageUri
      status
      chatRoomUser {
        items {
          id
          userID
          chatRoomID
          createdAt
          updatedAt
        }
        nextToken
      }
      createdAt
      updatedAt
    }
  }
`;
export const listUsers = /* GraphQL */ `
  query ListUsers(
    $filter: ModelUserFilterInput
    $limit: Int
    $nextToken: String
  ) {
    listUsers(filter: $filter, limit: $limit, nextToken: $nextToken) {
      items {
        id
        name
        imageUri
        status
        chatRoomUser {
          nextToken
        }
        createdAt
        updatedAt
      }
      nextToken
    }
  }
`;
export const getChatRoomUser = /* GraphQL */ `
  query GetChatRoomUser($id: ID!) {
    getChatRoomUser(id: $id) {
      id
      userID
      chatRoomID
      user {
        id
        name
        imageUri
        status
        chatRoomUser {
          nextToken
        }
        createdAt
        updatedAt
      }
      chatRoom {
        id
        chatRoomUsers {
          nextToken
        }
        createdAt
        updatedAt
      }
      createdAt
      updatedAt
    }
  }
`;
export const listChatRoomUsers = /* GraphQL */ `
  query ListChatRoomUsers(
    $filter: ModelChatRoomUserFilterInput
    $limit: Int
    $nextToken: String
  ) {
    listChatRoomUsers(filter: $filter, limit: $limit, nextToken: $nextToken) {
      items {
        id
        userID
        chatRoomID
        user {
          id
          name
          imageUri
          status
          createdAt
          updatedAt
        }
        chatRoom {
          id
          createdAt
          updatedAt
        }
        createdAt
        updatedAt
      }
      nextToken
    }
  }
`;
export const getChatRoom = /* GraphQL */ `
  query GetChatRoom($id: ID!) {
    getChatRoom(id: $id) {
      id
      chatRoomUsers {
        items {
          id
          userID
          chatRoomID
          createdAt
          updatedAt
        }
        nextToken
      }
      createdAt
      updatedAt
    }
  }
`;
export const listChatRooms = /* GraphQL */ `
  query ListChatRooms(
    $filter: ModelChatRoomFilterInput
    $limit: Int
    $nextToken: String
  ) {
    listChatRooms(filter: $filter, limit: $limit, nextToken: $nextToken) {
      items {
        id
        chatRoomUsers {
          nextToken
        }
        createdAt
        updatedAt
      }
      nextToken
    }
  }
`;

如果有人能试着看代码，告诉我是否有错误的代码，我会很高兴的，因为在我在控制台上运行查询之后，它不会给我它提供给我的结果。

我很感激任何人能提供的帮助，马蒂

Answer 1

因为您没有使用primaryKey(使用的是userID和chatRoomID)来处理hasMany关系。您需要在User和ChatRoom模型的@hasMany指令中添加@hasMany。

对于这种关系，@belongsTo和@hasMany indexName应该是相同的。

type User @model {
  id: ID!
  name: String!
  imageUri: String
  status: String
  chatRoomUser: [ChatRoomUser] @hasMany (indexName: "byUser")
}

type ChatRoomUser @model {
  id: ID! @primaryKey
  userID: ID! @index(name: "byUser", sortKeyFields: ["chatRoomID"])
  chatRoomID: ID! @index(name: "byChatRoom", sortKeyFields: ["userID"])
  user: User @belongsTo(fields: ["userID"])
  chatRoom: ChatRoom @belongsTo(fields: ["chatRoomID"]) 
}

type ChatRoom @model {
  id: ID!
  chatRoomUsers: [ChatRoomUser] @hasMany (indexName: "byChatRoom")
}

有关更多信息，请查看放大GraphQL文档