Cayley Graph Database Example - Get user with friends

do_query.js

function predicatesToList(thingId) {
  var thing = g.V(thingId);
  var result = [];

  thing.outPredicates().map(function(a){
    if (!a) return;
    thing.out(a.id).map(function(b){
      result.push([a.id, b.id]);
    });
  });
  
  return result;
}

function followLinks(options, data) {
  if (options && Object.keys(options).length) {
    Object.keys(options).forEach(function(key){
      if (!key) return;
      var action = key;
      var predicate = options[key];

      if (action === 'follow') {
        data[predicate].forEach(function(nodeId, idx){
          data[predicate][idx] = getThing(nodeId, { omit: '<friend>' });
        });
      }
      else if (action === 'omit') {
        delete data[predicate];
      }
    });
  }

  return data;
}

function collapseArray(arr) {
  var result = {};

  arr.forEach(function(item) {
    var key = item[0];
    var val = item[1];

    if (key[0] === '<' && key.slice(-1) === '>') {
      result[key] = result[key] || [];
      result[key].push(val);
    }
    else {
      result[key] = val;
    }
  });
  return result;
}

function getThing(thingId, options) {
  var asArray = predicatesToList(thingId);
  var asObject = collapseArray(asArray);
  var finalResults = followLinks(options, asObject);

  finalResults.id = thingId;
  return finalResults;
}

g.emit(getThing('uuid12345', { follow: '<friend>' }));

dump.nq

"uuid12345" "email" "[email protected]" .
"uuid12345" "firstName" "Jim" .
"uuid12345" "lastName" "Jones" .
"uuid12345" "worksFor" "Corporation Inc." .
"uuid12345" <friend> "uuid12346" .
"uuid12345" <friend> "uuid12347" .
"uuid12346" "email" "[email protected]" .
"uuid12346" "firstName" "Joe" .
"uuid12346" "lastName" "Smith" .
"uuid12346" "worksFor" "Apple" .
"uuid12346" <friend> "uuid12345" .
"uuid12347" "email" "[email protected]" .
"uuid12347" "firstName" "Alice" .
"uuid12347" "lastName" "Cooper" .
"uuid12347" "worksFor" "LinkedIn" .
"uuid12347" <friend> "uuid12345" .

sample_results.json

{
	"result": [
		{
			"<friend>": [
				{
					"email": "[email protected]",
					"firstName": "Joe",
					"id": "uuid12346",
					"lastName": "Smith",
					"worksFor": "Apple"
				},
				{
					"email": "[email protected]",
					"firstName": "Alice",
					"id": "uuid12347",
					"lastName": "Cooper",
					"worksFor": "LinkedIn"
				}
			],
			"email": "[email protected]",
			"firstName": "Jim",
			"id": "uuid12345",
			"lastName": "Jones",
			"worksFor": "Corporation Inc."
		}
	]
}