EntityController.js

 server.get('/api/entities', function (req, res, next) {
    var criteria = new Predicates.Criteria(server.db);
    criteria.select('Entity').from('Entity');

    if (req.query.type) {
      criteria.add(Predicates.eq('Entity.type', req.query.type));
    }

    if (req.query.name) { //TODO: escape regex
      criteria.add(Predicates.match('Entity.name', '^' + req.query.name));
    }

    if (req.query.sourceOf){
      criteria.from('Relation');
      criteria.eqJoin('Entity', 'sourceId', 'Entity');
      criteria.add(Predicates.eq('Relation.type', req.query.sourceOf));
    }

    Entity.execute(criteria.all(), function (err, result) {
      if (err) {
        return next(err);
      }
      res.send(result);
    });
  });