so-question

The main issue is that your line

    q.query({uid:"dan"})

is not synchronous. So your promise resolves with undefined. You need to do two things:

1. Pass a callback to your query function so you can retrieve the value of your query
2. Resolve the promise with the result of this query.

So here we're passing a callback to your custom `query` function...

        module.exports = {
          query: function (qry, callback /* this is how you get the result */) {
            MongoClient.connect(url, function (err, db) {
              if (err) throw err;
              var dbo = db.db("invDB");
              dbo.collection("products").find(qry).toArray(function (err, result) {
                if (err) {
                  return callback(err);
                }
                callback(null, result[0]); // here we call the callback
                db.close();
              });
            });
          },
        ...
        };

And now we're using the result of that callback to resolve the promise with...


    router.get('/getProduct', function (req, res) {
      var test = new Promise(function (resolve, reject) {
        q.query({ uid: 'dan' }, (error, data) => {
          if (error) {
            return reject(error);
          }
          resolve(data);
        });
     });
     test.then(data => { ... })
         .catch(e => { ... })
    });

Thanks so much for not only answering the question but also walking me though this! I'll try this when I get home.

Hi, This worked like a charm. I can't thank you enough!