PrismaP
Prisma•2y ago
Baptiste Marchand

Adding fields to a templated `select`

Hi,

Let's say I have a 
getUser
 function, which takes a 
select
 as its argument :
const getUser = async <T extends Prisma.UserSelect>(select: T) => {
  return await prisma.user.findFirst({select})
}


Now I want to add a log that says which user I'm getting, so I try this :
const getUser = async <T extends Prisma.UserSelect>(select: T) => {
  const user = await prisma.user.findFirst({
    select: {...select, id: true},
  })
  console.log(`Getting user ${user.id}`)
  return user
}


But now I have the following TypeScript error: 
Type 'T & { id: true; }' is not assignable to type 'T & { id: true; }'. Two different types with this name exist, but they are unrelated.


So I found the workaround of creating a variable for the select :
const getUser = async <T extends Prisma.UserSelect>(select: T) => {
  const selectWithId = {...select, id: true}
  const user = await prisma.user.findFirst({select: selectWithId})
  console.log(`Getting user ${user.id}`)
  return user
}

That gets rid of the previous error, but I still have an error on the 
user.id
 : 
Property 'id' does not exist on type GIANT_TYPESCRIPT_TYPE
.

Is there a workaround for this? Adding fields to a templated select is a use-case that came up a few times already in my codebase so I'm trying to find a proper solution (right now we just slap an 
any
 on there).

Thank you
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