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// Route for creating a new Review and updating Product "review" field with it
app.post("/product/:id", function(req, res) {
  // Create a new note and pass the req.body to the entry
  db.Review.create(req.body)
    .then(function(dbReview) {
      // If a Review was created successfully, find one Product with an `_id` equal to `req.params.id`. Update the Product to be associated with the new Review
      // { new: true } tells the query that we want it to return the updated Product -- it returns the original by default
      // Since our mongoose query returns a promise, we can chain another `.then` which receives the result of the query
      return db.Product.findOneAndUpdate({ _id: req.params.id }, { review: dbReview._id }, { new: true });
    })
    .then(function(dbProduct) {
      // If we were able to successfully update a Product, send it back to the client
      res.json(dbProduct);
    })
    .catch(function(err) {
      // If an error occurred, send it to the client
      res.json(err);
    });
});