Add ability to unlink optional relation

[2color]

I was trying to unlink a post from a specific author and couldn't find a way to do that with Prisma Studio:

1. Prisma version (prisma -v or npx prisma -v):

@prisma/cli          : 2.15.0
@prisma/client       : 2.15.0
Current platform     : darwin
Query Engine         : query-engine e51dc3b5a9ee790a07104bec1c9477d51740fe54 (at node_modules/@prisma/engines/query-engine-darwin)
Migration Engine     : migration-engine-cli e51dc3b5a9ee790a07104bec1c9477d51740fe54 (at node_modules/@prisma/engines/migration-engine-darwin)
Introspection Engine : introspection-core e51dc3b5a9ee790a07104bec1c9477d51740fe54 (at node_modules/@prisma/engines/introspection-engine-darwin)
Format Binary        : prisma-fmt e51dc3b5a9ee790a07104bec1c9477d51740fe54 (at node_modules/@prisma/engines/prisma-fmt-darwin)
Studio               : 0.340.0

4. Prisma schema (if relevant):

generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

model Post {
  id        Int     @default(autoincrement()) @id
  title     String
  content   String?
  published Boolean @default(false)
  author    User?   @relation(fields: [authorId], references: [id])
  authorId  Int?
}

model User {
  id    Int     @default(autoincrement()) @id
  email String  @unique
  name  String?
  posts Post[]
}

[sdnts]

I don't know how I'm just seeing this, but this is most definitely a bug. The relation and the scalar field it is composed of should have a two-way binding. If you clear the relation, it should change the scalar and register as an edit. (and the other way around)

I'll take a look soon! Thanks for reporting!

[sdnts]

@2color This should now be possible in the latest dev version of the Prisma CLI. This will also make it to 2.18.0 this Tuesday!