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// Route for retrieving a Product by id and populating it's Review.
app.get("/products/:id", function(req, res) {
  // Using the id passed in the id parameter, prepare a query that finds the matching one in our db...
  db.Product.findOne({ _id: req.params.id })
    // ..and populate all of the notes associated with it
    .populate("review")
    .then(function(dbProduct) {
      // If we were able to successfully find an Product with the given id, send it back to the client
      res.json(dbProduct);
    })
    .catch(function(err) {
      // If an error occurred, send it to the client
      res.json(err);
    });
});