Filter based on number / count of relations

Problem

I have an e-commerce platform that requires me to list cities if there is an associated product with that city. However, we have a couple cities that there is currently no products associated with and therefore we don’t want those cities to show up.

model Locations {
  id                       Int        @default(autoincrement()) @id
  country                  String
  location                 String     @unique
}

model Products {
  id               Int           @default(autoincrement()) @id
  title            String
  city             String
  base_price       Int
  hidden           Boolean       @default(false)
  locations        locations     @relation(fields: [city], references: [location])
}

Assuming I have 3 cities: Boston, New York City, Miami.

Boston and New York City both have products. However, Miami does not have a product associated with that location.

On my prisma.Locations.findMany({}), I only want to get Boston and New York City since Miami does not have any products associated with it.

How can I go about this?

Suggested solution

    const paths = await prisma.locations.findMany({
      where: {
        Products: {
          not: null // anything to show product relations greater than 0
        }
      }
    })

Additionally

Additionally, another feature would be to not only check if there is a relation but filter it based on relations that I don’t want appearing. For example if Miami in this case did have 1 product. But the product appeared as hidden: true. I would not want Miami to appear under prisma.locations.findMany() because the only product that it has is considered hidden: true.

Alternatives

Additional context

[alimehasin]

It would be great if we can filter the users based on a min and a max number of posts (Get all users that has posts between 3 and 10)

[viperfx]

any reason why this feature request was closed? Filtering or ordering on counts of related fields will be really useful