whole_func_string: function(attributes, cb) {
          var id = attributes.uuid || attributes.name || attributes.username;
          this.find(id, function (err, entity) {
            if (err) { return cb(err); }
            entity.update(attributes, cb);
          });
        }
func_code_string: function(attributes, cb) {
          var id = attributes.uuid || attributes.name || attributes.username;
          this.find(id, function (err, entity) {
            if (err) { return cb(err); }
            entity.update(attributes, cb);
          });
        }
func_documentation_string: updates entity immediately on the server w/ attributes and returns the entity