Find record with an empty relation

Say I have this prisma schema with an implicit m:n-relation of Post and Tag

model Post {
  id   String @id
  tags Tag[]
}

model Tag {
  id    Int    @id @default(autoincrement())
  posts Post[]
}

How do I find the first Post that has no associated Tags?

prisma.post.findFirst({
  where: {
    tags: {
      // are nonexistent (something like count === 0?)
    },
  },
}),

Thanks for the help 🙂

>Solution :

You can probably use orderBy by count of tags in ascending order and get the first one? Like that:

prisma.post.findFirst({
  orderBy: { tags: { _count: 'asc' } },
});