Prisma - One-to-many relationship

To create One-to-many relationship in Prisma, you have to make sure that the model, that has to be unique has @unique in a model.

model Person {  
  id           String        @unique @default(cuid())  
  name         String  
  phoneNumbers PhoneNumber[]  
}  
  
model PhoneNumber {  
  id       String @default(cuid())  
  number   String  
  person   Person @relation(fields: [personId], references: [id], onDelete: Cascade, onUpdate: Cascade)  
  personId String   
}