Add equivalent of Dgraph's 'has' to GraphQL

Issues Dgraph
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1

Moved from GitHub dgraph/5819

Posted by MichaelJCompton:

It’s currently not possible to filter in GraphQL by if a node does or does not have a particular edge. We, should port Dgraph’s has condition to solve that.

Expect it to look like

queryUser(filter: { has: friends }) { 
   ... 
}

or

{
  queryUser(filter: {firstName: {eq: null}}) {
    username
    firstName
  }
}
2

please track this issue here: Tracking zero counts

3

Fixed by: feat(GraphQL): add has filter support by minhaj-shakeel · Pull Request #6258 · dgraph-io/dgraph · GitHub

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