Error when generating from schema with polymorphic models - given constraint name `...` has to be unique in the following namespace...

[andrewkucz]

Description and expected behavior

I've been playing around with the 2.0 polymorphic features of zenstack and ran into an issue I can't seem to get around / find documented here:

"Generating Prisma schema" completes successfully but I run into the following error during "Generating PrismaClient enhancer"

error: Error parsing attribute "@relation": The given constraint name `UserFavorite_id_fkey` has to be unique in the following namespace: on model `UserFavorite` for primary key, indexes, unique constraints and foreign keys. Please provide a different name using the `map` argument.
  -->  schema.prisma:69
   | 
68 |     delegate_aux_personId String
69 |     delegate_aux_studio Studio @relation(fields: [id], references: [id])
70 |     delegate_aux_studioId String
   | 

Validation Error Count: 4
[Context: getDmmf]

Prisma CLI Version : 5.10.2
✖ Generating PrismaClient enhancer
Prisma: Failed to run "prisma generate

Here is a simplified version of my schema.zmodel:

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

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

model User {
    id            String    @id @default(cuid())
    name          String

    userRankings UserRanking[]
    userFavorites UserFavorite[]
}


model Entity {
  id      String          @id @default(cuid()) 
  name    String  
  type String
  userRankings UserRanking[]
  userFavorites UserFavorite[]

  @@delegate(type)
}

model Person extends Entity {
}

model Studio extends Entity {
}


model UserRanking {
  id      String       @id @default(cuid()) 
  rank     Int

  entityId      String
  entity        Entity        @relation(fields: [entityId], references: [id], onUpdate: NoAction)
  userId   String
  user     User @relation(fields: [userId], references: [id], onDelete: Cascade, onUpdate: NoAction)
}

model UserFavorite {
  id      String       @id @default(cuid()) 

  entityId      String
  entity        Entity        @relation(fields: [entityId], references: [id], onUpdate: NoAction)
  userId   String
  user     User @relation(fields: [userId], references: [id], onDelete: Cascade, onUpdate: NoAction)
}

Based on the error message, I think a possible solution would be to add a map property to the relation attribute as it suggests. When I go in and modify node_modules\.zenstack\delegate.prisma just to try it out, the IDE error goes away at least so I think its promising. Maybe on generation this should be added? Or an option to specify this somewhere in the zmodel?

// delegate.prisma
-- delegate_aux_studio Studio @relation(fields: [id], references: [id])
++ delegate_aux_studio Studio @relation(fields: [id], references: [id], map: "studio")

Environment (please complete the following information):

• ZenStack version: 2.0.0-alpha.1
• Prisma version: 5.10.2
• Database type: postgresql

Additional context

Oddly enough changing the generator provider to sqlite seems to remedy the issue (something prisma related?) but I was hoping to use postgresql

Thanks
-Andrew

[ymc9]

Hi @andrewkucz , thanks for reporting the issue. Yes, you're right, the generated delegate.prisma should include the "map" argument to disambiguate fk constraints. I'll make a fix in the next alpha release.

[andrewkucz]

Hi @andrewkucz , thanks for reporting the issue. Yes, you're right, the generated delegate.prisma should include the "map" argument to disambiguate fk constraints. I'll make a fix in the next alpha release.

Thanks for the swift feedback @ymc9 -- thats great to hear! And props on an awesome library, excited to use it!

[ymc9]

Fixed in 2.0.0-alpha.6