Prisma•3mo ago

using prisma $extends to add fields to a model, whats the best practice for TS?

Below is how i add a custom "client" field to my tokens model - but now my Token model doesn't really match since there is no client field in that. What is the best practice for taking care of that?

const prisma = globalThis.prismaGlobal ?? prismaClientSingleton().$extends({
  name: 'tokenParser',
  result: {
    token: {
      client: {
        needs: {
          agent: true,
        },
        compute({ agent }) {
          return new UAParser(agent).getResult()
        },
      },
    },
  },
})

const prisma = globalThis.prismaGlobal ?? prismaClientSingleton().$extends({
  name: 'tokenParser',
  result: {
    token: {
      client: {
        needs: {
          agent: true,
        },
        compute({ agent }) {
          return new UAParser(agent).getResult()
        },
      },
    },
  },
})

5 Replies

acidjazz•3mo ago

anyone know the proper way of doing this?

Ustice•3mo ago

You should be able to get the client property on the type returned by a query.

function fetchTokenClient () {
  return prisma.token.findFirstOrThrow()
}

type TokenWithClient = Prisma.PromiseReturnType<typeof fetchTokenClient>

function fetchTokenClient () {
  return prisma.token.findFirstOrThrow()
}

type TokenWithClient = Prisma.PromiseReturnType<typeof fetchTokenClient>

Ustice•3mo ago

You can read about this in the docs.

Operating against partial structures of your model types | Prisma D...

This page documents various scenarios for using the generated types from the Prisma namespace

acidjazz•3mo ago

well, the way i'm doing/asking this, i'm doing an $extend, so i want it in Token . it will always be Token. I'm not just doing a query with an include

Ustice•3mo ago

That’s what I am saying. You can redefine the types that are generated by Prisma; however, it is possible to extract the types from the Prisma client, and use those instead.

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using prisma $extends to add fields to a model, whats the best practice for TS?