Support aggregations (e.g. count) on nested relations

Problem

Right now if you want to just get the count of the model in the same query, it is not possible.

Suggested solution

Introduce an aggregate key in include/select for nested relation in addition to the where key

const users = await prisma.user.findMany({
  include: {
    _count: {
      select: {
        posts: true,
      },
    },
  },
})

Alternatives

Doing a separate aggregate call for fetching the count.

Additional context

Suggestion by @kitze from the livestreams.

[nrxus]

Does anyone have an alternative for getting the “user” with the highest number of “posts”?

I have been trying to wrap my head around the current aggregate preview api, but it doesn’t seem possible to get the record with the highest count of related records. I am guessing it is not currently possible in prisma (in a single prisma statement)?

[rodrigoehlers]

This would be very useful. Any update on this? Is this being worked on or planned to be worked on?