code: function(req, res) {
              var name = req.params.name;
              var id   = this.toId(req.params.id);
              if (typeof id === 'undefined' || id === '') {
                  return res.send(400, "invalid id.");
              }
              var collection = new mongodb.Collection(this.db, name);
              collection.find({ "_id" : id }, { limit:1 }).nextObject(function(err, doc){
                      if(err){
                          res.send(400, err);
                      } else if (doc) {
                          res.send(doc);
                      } else {
                          res.send(404, 'Document not found!');
                      }
                  }
              );
          }
docs: Find a specific document