Guide to setting up a one-to-many self relation entry in Prisma

Question

Guide to setting up a one-to-many self relation entry in Prisma

I am facing a challenge with a simple schema model that includes one-to-many self relations. In this scenario, my goal is to create a parent entity along with its children in a single transaction. How can I accomplish this task effectively?

data-model Y{

  id   Number      @id @default(autoincrement())
  title String

  childYs Y[] @relation("childY")

  parentY   Y? @relation("childY", fields: [parentYId], references: [id])
  parentYId Number?

}

typescript postgresql orm nestjs prisma

Answer 1

Answer №1

To achieve this, you can use nested create operations in your code.

import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();

async function main() {
  const createParentAndChild = await prisma.x.create({
    data: {
      name: 'x',
      parentX: {
        create: {
          name: 'parentX',
        },
      },
      childXs: {
        create: {
          name: 'childX',
        },
      },
    },
  });

  console.log('createParentAndChild', createParentAndChild);
}

main()
  .catch((e) => {
    throw e;
  })
  .finally(async () => {
    await prisma.$disconnect();
  });

The response will be:

createParentAndChild { id: 2, name: 'x', parentXId: 1 }

Answer 2

To achieve this, you can use nested create operations in your code.

import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();

async function main() {
  const createParentAndChild = await prisma.x.create({
    data: {
      name: 'x',
      parentX: {
        create: {
          name: 'parentX',
        },
      },
      childXs: {
        create: {
          name: 'childX',
        },
      },
    },
  });

  console.log('createParentAndChild', createParentAndChild);
}

main()
  .catch((e) => {
    throw e;
  })
  .finally(async () => {
    await prisma.$disconnect();
  });

The response will be:

createParentAndChild { id: 2, name: 'x', parentXId: 1 }

Guide to setting up a one-to-many self relation entry in Prisma

Answer №1

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