Prisma•4mo ago

How to add a custom field on query result?

I have an implicit many-to-many relation: User and Post. A user could like many posts, and a post could be liked by many users. Here is the schema:

model User {
  id         String    @id @default(dbgenerated("uuid_generate_v4()")) @db.Uuid
  posts      Post[]    @relation("author")
  likes      Post[]    @relation("like")

  @@map("users")
}

model Post {
  id         String    @id @default(dbgenerated("uuid_generate_v4()")) @db.Uuid
  author     User      @relation("author", fields: [author_id], references: [id])
  author_id  String    @db.Uuid
  comments   Comment[]
  likedBy    User[]    @relation("like")

  @@map("posts")
}

model User {
  id         String    @id @default(dbgenerated("uuid_generate_v4()")) @db.Uuid
  posts      Post[]    @relation("author")
  likes      Post[]    @relation("like")

  @@map("users")
}

model Post {
  id         String    @id @default(dbgenerated("uuid_generate_v4()")) @db.Uuid
  author     User      @relation("author", fields: [author_id], references: [id])
  author_id  String    @db.Uuid
  comments   Comment[]
  likedBy    User[]    @relation("like")

  @@map("posts")
}

Now I want to get the post lists to render. For every post, there will be a heart showing if it's already liked by current user. How could I get a structure with type Post & { isLiked: boolean } ? It would be perfect if it could be done in one query.

1 Reply

RaphaelEtim•4mo ago

This has been answered in this Github Discussion

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Question I have an implicit many-to-many relation: User and Post. A user could like many posts, and a post could be liked by many users. Here is the schema: model User { id String @id @default(dbge...

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How to add a custom field on query result?