`thread '<unnamed>' panicked at 'Did not find a relation for model users and field editedmessages'`

generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["mongoDb", "fullTextSearch"]
}

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

model editedmessages {
  id          String   @id @default(auto()) @map("_id") @db.ObjectId
  userId String
  oldMessage String
  newMessage String
  editDate String
  messageID String
  user   users   @relation("users", fields: [userId], references: [userId], onDelete: NoAction, onUpdate: NoAction)
  users  users[]
}

model stafftags {
  id          String   @id @default(auto()) @map("_id") @db.ObjectId
  v           Int      @map("__v")
  fullMessage String
  type        String[]
  userId      String
}

model statistics {
  id    String @id @default(auto()) @map("_id") @db.ObjectId
  v     Int    @map("__v")
  date  String
  total Int
  type  String
}

model users {
  id               String           @id @default(auto()) @map("_id") @db.ObjectId
  v                Int              @map("__v")
  avatarURL        String
  firstMessage     String
  lastMessage String?
  userId           String           @unique(map: "userId_1")
  username         String           @unique(map: "username_1")
  statistics       userstatistics   @relation(fields: [userId], references: [userId])
  userstatistics   userstatistics[] @relation("users")
  message       editedmessages   @relation(fields: [userId], references: [userId])
  editedmessages   editedmessages[] @relation("users")
}

model userstatistics {
  id     String  @id @default(auto()) @map("_id") @db.ObjectId
  v      Int     @map("__v")
  total  Int
  userId String
  user   users   @relation("users", fields: [userId], references: [userId], onDelete: NoAction, onUpdate: NoAction)
  users  users[]
}

model webusers {
  id       String  @id @default(auto()) @map("_id") @db.ObjectId
  username String
  password String
  email    String
  admin    Boolean
}

Throws an error,

❯ npx prisma format
Prisma schema loaded from prisma\schema.prisma
thread '<unnamed>' panicked at 'Did not find a relation for model users and field editedmessages', query-engine\prisma-models\src\builders\internal_dm_builder.rs:122:25
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Error: Unexpected token D in JSON at position 0

_Originally posted by @schwarzsky in https://github.com/prisma/prisma/issues/4854#issuecomment-1117845073_

[janpio]

Here is a more minimal version of the schema that shows the same crash:

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

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

model editedmessages {
  id         String  @id @default(auto()) @map("_id") @db.ObjectId
  userId     String
  user       users   @relation("users", fields: [userId], references: [userId])
}

model users {
  id             String           @id @default(auto()) @map("_id") @db.ObjectId
  userId         String           @unique
  userstatistics userstatistics[] @relation("users")
  editedmessages editedmessages[] @relation("users")
}

model userstatistics {
  id     String  @id @default(auto()) @map("_id") @db.ObjectId
  userId String
  user   users   @relation("users", fields: [userId], references: [userId])
}

The problem that seems to be causing this is that both relations are called users - changing 2 connected instances if users to users2 makes the schema pass validation:

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

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

model editedmessages {
  id     String @id @default(auto()) @map("_id") @db.ObjectId
  userId String
  user   users  @relation("users2", fields: [userId], references: [userId])
}

model users {
  id             String           @id @default(auto()) @map("_id") @db.ObjectId
  userId         String           @unique
  userstatistics userstatistics[] @relation("users")
  editedmessages editedmessages[] @relation("users2")
}

model userstatistics {
  id     String @id @default(auto()) @map("_id") @db.ObjectId
  userId String
  user   users  @relation("users", fields: [userId], references: [userId])
}

Was this schema created via Introspection @schwarzsky? It looks a bit like that. If so, can you open another issue and post a minimal sample of the data to create that schema via Introspection? That both relations get the same name is a bug that needs to be fixed as well.

[schwarzsky]

Thanks. Any help apprecaited.