ManyToMany join table model generates empty inputs

Bug description

When I define models with ManyToMany relation and separate join table (it’s happening when introspecting the existing database), Prisma client generates empty inputs for update many operations on that join table model:

How to reproduce

Generate Prisma client from schema below.

Then try to make updateMany operation - you’re not allowed to pass any keys to data object:

await prisma.studentClass.updateMany({ data: {}, where: { classId: 1 } });

Expected behavior

When mutation input has no fields, the whole operation should be not available as it makes no sense.

It should be removed from DMMF so other prisma ecosystem tools don’t suffer from this issue.

Prisma information

model Student {
  id           Int            @id @default(autoincrement())
  name         String
  StudentClass StudentClass[]
}

model Class {
  id           Int            @id @default(autoincrement())
  name         String
  StudentClass StudentClass[]
}

model StudentClass {
  studentId Int
  classId   Int
  student   Student @relation(fields: [studentId], references: [id])
  class     Class   @relation(fields: [classId], references: [id])

  @@id([studentId, classId])
}

Environment & setup

• OS: Windows 10 x64 @ WSL2 Ubuntu 20.04
• Database: PostgreSQL
• Node.js version: 14.13
• Prisma version:

@prisma/cli          : 2.9.0
@prisma/client       : 2.9.0
Current platform     : debian-openssl-1.1.x
Query Engine         : query-engine 369b3694b7edb869fad14827a33ad3f3f49bbc20 (at node_modules/@prisma/cli/query-engine-debian-openssl-1.1.x)
Migration Engine     : migration-engine-cli 369b3694b7edb869fad14827a33ad3f3f49bbc20 (at node_modules/@prisma/cli/migration-engine-debian-openssl-1.1.x)
Introspection Engine : introspection-core 369b3694b7edb869fad14827a33ad3f3f49bbc20 (at node_modules/@prisma/cli/introspection-engine-debian-openssl-1.1.x)
Format Binary        : prisma-fmt 369b3694b7edb869fad14827a33ad3f3f49bbc20 (at node_modules/@prisma/cli/prisma-fmt-debian-openssl-1.1.x)
Studio               : 0.296.0
Preview Features     : connectOrCreate, atomicNumberOperations

[MichalLytek]

Bump! It’s been a half-year since the last comment 😛 It’s a pretty urgent issue I believe, and the workarounds are hard to achieve. 😞

[matthewmueller]

Folks using typegraphql-prisma are running into this quite a lot.

Issues:

• https://github.com/MichalLytek/typegraphql-prisma/issues/19
• https://github.com/MichalLytek/typegraphql-prisma/issues/76