Please support uid type for facet edge attributes

Issues Dgraph
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2

I think adding the type UID in facets is a valid request. Cuz it opens the possibility to do Hypergraphs. Ofcourse, the Hypergraph wouldn’t be “native” as facets aren’t first-class citizens. But it would be great for users who wanna explore the Hypergraph concepts.

What I have tried to reproduce here

{
  set {
    _:alice <name> "Alice" .
    _:alice <friend> _:bob (close=true, relative=false) .
    _:bob <name> "Bob" .
    _:charlie <name> "Charlie" .
  }
}

One thing to add is give blank nodes support in facets. e.g.:

{
  set {
    _:alice <name> "Alice" .
    _:alice <friend> _:bob (close=true, relative=false, Presentedby="_:charlie") .
    _:bob <name> "Bob" .
    _:charlie <name> "Charlie" .
  }
}

So what I did to add the UID was.

upsert {
  query {   
    q(func: uid(0x2735)) {
     v as uid
      name 
      friend @facets {
         b as uid
         name
      }
    }
  }

  mutation {
    set {
      uid(v) <friend> uid(b) (close=true, relative=false, Presentedby=0x2737) .
    }
  }
}

Also, another good way would be

upsert {
  query {
    
    CH as varg(func: eq(name, "Charlie"))
    
    q(func: uid(0x2735)) {
     v as uid
      name 
      friend @facets {
         b as uid
         name
      }
    }
  }

  mutation {
    set {
      uid(v) <friend> uid(b) (close=true, relative=false, Presentedby=uid(CH)) .
    }
  }
}

Worth to mention

Dgraph converts the UID to Hex. In my case it had converted 0x2737 to 10039

The Final Facet format with UID type.

{
   "data": {
      "q": [
         {
            "uid": "0x2735",
            "name": "Alice",
            "friend": [
               {
                  "name": "Bob",
                  "friend|Presentedby": {
                     "uid": "0x2737"
                  },
                  "friend|close": true,
                  "friend|relative": false
               }
            ]
         }
      ]
   }
}
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