Filter by counts in GraphQL

Users GraphQL
1

Looking at the Dgraph tour, I can

Find all people who are in their 20s, and have at least 2 friends.

{
  lots_of_friends(func: ge(count(friend), 2)) @filter(ge(age, 20) AND lt(age, 30)) {
    name@.
    age
    friend {
        name@.
    }
  }
}

How would you do this in GraphQL? A custom query backed by a lambda? If so then you lose all of the power of selecting fields and filtering on the subgraph.

2

Hi @verneleem, we have aggregate functions in GraphQL but can’t use them in the filter as of now.
https://dgraph.io/docs/master/graphql/queries/aggregate/
you can use the above DQL query in GraphQL using the custom DQL feature and for that you need to define schema appropriately.
https://dgraph.io/docs/master/graphql/custom/dql/#sidebar
Let me know if you need any help.

2 Likes