[PRISMA] Adding method with param in result object

Hi, I have seen the documentation about adding method to the result object. I would like to add a method with parameter, NOT static method in result object. Is that possible?

https://www.prisma.io/docs/concepts/components/prisma-client/client-extensions/result#add-a-custom-method-to-the-result-object

const user = await prisma.user.findUniqueOrThrow({ where: { id: someId } })
user.generateDiscount(discountPercent)

const user = await prisma.user.findUniqueOrThrow({ where: { id: someId } })
user.generateDiscount(discountPercent)

const user = await prisma.user.findUniqueOrThrow({ where: { id: someId } })
user.generateDiscount(discountPercent)

const user = await prisma.user.findUniqueOrThrow({ where: { id: someId } })
user.generateDiscount(discountPercent)

Finn•6/5/23, 3:51 PM

Does this method interact with the dB at all?

Finn•6/5/23, 3:52 PM

I'm hesitant to say this is a good pattern tbh. My brain would just make a generateDiscount util function that takes a user and a discountPercent

MirOP•6/5/23, 3:53 PM

No. It will interact with some of the result value.

MirOP•6/5/23, 3:56 PM

That's one solution for sure. But it's a big app, so a method would help maintaining and keep track of it.

Finn•6/5/23, 4:00 PM

Idk my fp lovers will disagree. If you want it though what's not working about the approach linked on the docs above?

Finn•6/5/23, 4:00 PM

Does it not allow a second argument or somthing?

Finn•6/5/23, 4:01 PM

The other option would be to create a method that take a user and mounts the fucntion, so in effect your query result really is a dto

Finn•6/5/23, 4:09 PM

Finn•6/5/23, 4:11 PM

const hydrateUser = (user: RawUser): User => {
    user.someThing = () => ({})
    user.otherThing = () => ({})
    return user;
}

const hydrateUser = (user: RawUser): User => {
    user.someThing = () => ({})
    user.otherThing = () => ({})
    return user;
}

const user = prsima....
return hydrateUser(user)

const user = prsima....
return hydrateUser(user)