Possibility to merge & extend prisma models ?

As there is most likely a parser for .prisma files (See #92) coming soon, it would be nice to have the possibility to merge & extend existing models, like:

post.prisma

model Post {
  title String @pg.varchar(42)
  body  String
}

core.prisma

import "./post.prisma"

model User {
  posts Post[]
}

Use case: let’s assume core.prisma & post.prisma are a package dependency and I’d like to extend and overwrite the Post model:

schema.prisma

import "dependency/prisma/core.prisma"

extend model Post {
  title String @pg.varchar(50)
  slug String
}

[pantharshit00]

Pasting your suggested API here:

snippet AuditRecords {
  createdAt     DateTime   @default(now())
  createdBy     String
  updatedAt     DateTime   @updatedAt
  updatedBy     String
}

snippet StandardId {
  id          String   @default(cuid()) @id
}

Model User {
  @snippet['StandardId']
  name String
  email String
  @snippet['AuditRecords']
}

Model SomethingElse {
  id         Int       @id @default(autoincrement())
  name String
  email String
  @snippet['AuditRecords']
}

The API suggested in the first post of this issue is not final or anything, it is just to showcase the idea but we appreciate your suggestion 😃

[Gomah]

Yup, the interface type would be great

Can you describe why you’d like to override a field?

If multiple models are treated as a dependency, being able to extend & override its original value would be ideal, e.g:

# dependency/user.prisma
model User {
  id      String   @default(cuid()) @id
  email   String @unique
}

# dependency/post.prisma
model Post {
  id       String   @default(cuid()) @id
  title    String    @pg.varchar(42)
  body     String
}

Vendor applications:

import "package/user.prisma"
import "package/post.prisma"

extend model User {
  posts  Post[]
}

extend model Post {
  title    String @pg.varchar(50)
  user     User @relation(fields: [userId], references: [id])
  userId   String 
}

That way, I can easily compose my prisma schema from existing datamodels.

I came across an interesting project that temporarily solves this issue: https://github.com/amplication/prisma-schema-dsl