Internal: reformatter is not idempotent

[tomhoule]

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

datasource db {
  provider = "mongodb"
  url      = "m...ty"
}

model Foo {
  id       String   @id @default(auto()) @map("_id") @db.ObjectId
  name     String   @unique
  json     Json
  bar      Bar
  bars     Bar[]
  baz      Baz      @relation(fields: [bazId], references: [id])
  bazId    String   @db.ObjectId
  list     String[]
  jsonList Json[]
}

type Bar {
  label  String
  number Int
}

model Baz {
  id  String @id @default(auto()) @map("_id") @db.ObjectId
  foo Foo?
}

The problem is the ordering of the attributes on bazId. The first reformatter run adds an @unique attribute because it's a 1:1 relation. Due to the way the reformatter is implemented, that attribute lands at the end of the list. The second run applies the expected ordering for attributes, putting @unique before @db.ObjectId.

related: #12580