GraphQL AWS Amplify @connection 没有引入连接的数据

Question

正如您所看到的，我希望在联赛表中显示所有赛季和分区data > seasons。我已经设置了它，因为我相信可以使用@connection。

所以问题是，我将如何更改我的部门架构，以便将部门包含在League.

我花了很多时间阅读@connections和@key并理解在使用密钥时，会使用我提供的密钥创建散列ID。但是我对多次阅读连接文档的理解不够了解为什么这不起作用。

我很想更好地理解这一点，所以我尽我所能尝试发展一种理解！

nb 我相信还值得一提的是，每次我更改架构并amplify mock重建哈希键时，它们都会被添加。我想知道这是否有一些影响？当涉及到键时，我应该在每次模式更改时完全清理 SQLite 吗？

联赛架构

type League @model
{
  id: ID!
  name: String!
  faId: ID!
  logo: String
  seasons: [Season] @connection(keyName: "bySeason", fields: ["id"])
  division: [Division] @connection(keyName: "byDivision", fields: ["id"])
}

四季沙玛

type Season @model @key(name: "bySeason", fields: ["leagueID"])
{
  id: ID!
  name: String!
  faId: ID!
  yearStart: AWSDate
  yearEnd: AWSDate
  leagueID: ID!
  league: League! @connection(fields: ["leagueID"])
  division: [Division] @connection(keyName: "byDivision", fields: ["id"])
}

分区模式

type Division @model
@key(name: "byDivisionFromSeason", fields: ["leagueID" "name"])
@key(name: "byDivision", fields: ["seasonID", "leagueID"])
{
  id: ID!
  name: String!
  faId: ID!
  divisionSeasonFaId: String
  leagueID: ID!
  seasonID: ID!
  league: League! @connection(fields: ["leagueID"])
  season: Season! @connection(fields: ["seasonID"])
  teams: [TeamConnection] @connection(keyName: "byTeamDivision", fields: ["id"])
  games: [Game] @connection(keyName: "byGameForDivision", fields: ["id"])
  ageInput: String!
  level: Int!
}

查询

  listLeagues {
    items {
      name
      division {
        items {
          name
        }
      }
      seasons {
        items {
          name
          division {
            items {
              name
            }
          }
        }
      }
    }
  }

数据

我在这里表明结构是正确的，因为Seasons包含在League具有Divisions预期的

{
  "data": {
    "listLeagues": {
      "items": [
        {
          "name": "Southern Amateur League",
          "division": {
            "items": []
          },
          "seasons": {
            "items": [
              {
                "name": "2020-21",
                "division": {
                  "items": [
                    {
                      "name": "Junior Section Division 5B South"
                    },
                    {
                      "name": "Junior Section Division 4 South"
                    },
                    {
                      "name": "Intermediate Division 3"
                    },
                  ]
                }
              },
              {
                "name": "2019-20",
                "division": {
                  "items": []
                }
              },
            ]
          }
        }
      ]
    }
  }
}

编辑

由于减少了对师刚刚的钥匙，seasonID并leagueID在每个键，清除数据当它出现抛出一个异常错误。我曾相信 @connection 上的 return null 是完全有效的？

Answer 1

由于您要在分区上设置两种不同类型的查询模式（一种来自使用联赛 ID 的联赛，另一种来自使用赛季 ID 的赛季），因此您应该创建两个索引。尝试这样的事情：

type League @model {
  id: ID!
  name: String!
  faId: ID!
  logo: String
  seasons: [Season] @connection(keyName: "bySeason", fields: ["id"])
  division: [Division] @connection(keyName: "byDivision", fields: ["id"])
}

type Season @model @key(name: "bySeason", fields: ["leagueID"]) {
  id: ID!
  name: String!
  faId: ID!
  yearStart: AWSDate
  yearEnd: AWSDate
  leagueID: ID!
  league: League! @connection(fields: ["leagueID"])
  division: [Division] @connection(keyName: "byDivisionFromSeason", fields: ["id"])
}

type Division @model
  @key(name: "byDivisionFromSeason", fields: ["seasonID", "leagueID", "name"])
  @key(name: "byDivision", fields: ["leagueID", "seasonID", "name"]) {
  id: ID!
  name: String!
  faId: ID!
  leagueID: ID!
  seasonID: ID!
  league: League! @connection(fields: ["leagueID"])
  season: Season! @connection(fields: ["seasonID"])
  ageInput: String!
  level: Int!
}