Prisma•3d ago

narrow down String type using prisma client's extension?

can I explain to prisma client and typescript that this particular field needs to be a string union?

model Lesson {
  id            Int       @id @default(autoincrement())
  type          String? // null | "practical" | "seminar" | "lecture"

model Lesson {
  id            Int       @id @default(autoincrement())
  type          String? // null | "practical" | "seminar" | "lecture"

2 Replies

ofc there are no unions on the DB level, I just want editor-level unions

Prisma does not have built-in support for defining string union types directly in the schema. You could consider using an enum

enum LessonType {
  practical
  seminar
  lecture

}

model Lesson {
  id   Int         @id @default(autoincrement())
  type LessonType?
}

enum LessonType {
  practical
  seminar
  lecture

}

model Lesson {
  id   Int         @id @default(autoincrement())
  type LessonType?
}