如何在 prisma 中搜索 M 到 N 的关系？

Question

我现在正在用 prisma 做项目。我设计了 m 到 n 的关系 table。下面是我的代码。 schema.prisma

model Artists {
  id                 Int                  @id @default(autoincrement())
  artistName         String?
  Albums             Albums[]
  Artists_Tracks     Artists_Tracks[]
}

model Artists_Tracks {
  id       Int      @id @default(autoincrement())
  trackId  Int?
  artistId Int?
  Artists  Artists? @relation(fields: [artistId], references: [id])
  Tracks   Tracks?  @relation(fields: [trackId], references: [id])

  @@index([artistId], name: "Artists_Tracks_artistId_foreign_idx")
  @@index([trackId], name: "Artists_Tracks_trackId_foreign_idx")
}

model Tracks {
  id                Int                 @id @default(autoincrement())
  trackName         String?
  albumTrackNumber  Int?
  albumId           Int?
  Albums            Albums?             @relation(fields: [albumId], references: [id])
  Artists_Tracks    Artists_Tracks[]

  @@index([albumId], name: "Tracks_albumId_foreign_idx")
}

这是我的棱镜代码。我想做的是按曲目名称搜索并获取所有曲目的信息和艺术家的名字。

+编辑）我试过的是

// first try
optObj.include = {
    Albums: {
      select: { cover: true },
    },
    Artists_Tracks: {
       Albums: true
    },
 };

// second try
optObj.include = {
    Albums: {
      select: { cover: true },
    },
    Artists_Tracks: true,
    Artists: true,
  };


  const result = await prisma.tracks.findMany(optObj);

并使用 promise.all 获取每首曲目的艺术家姓名。有什么办法可以一次查询完成吗？我很确定会有更好的方法来做到这一点。提前谢谢你。

Answer 1

根据您的架构，include 将不包含 Artist 关系。它必须包含在 Artists_Tracks 关系中，如下所示：

const result = await prisma.tracks.findMany({
    include: {
      Albums: {
        select: { cover: true },
      },
      Artists_Tracks: { include: { Artists: true } },
    },
})

通过这种方式，您可以获得每首曲目的 Artist。

如何在 prisma 中搜索 M 到 N 的关系？

How to search M to N relationship in prisma?

orm

prisma

prisma-graphql

nexus-prisma

prisma2