parse_update.js

  validateCoupon = async (id) => {
    let _this = this;
    var Comments = Parse.Object.extend("Comments");
    var query = new Parse.Query(Comments);
    query.equalTo("objectId", id);
    await query.first({
      success: function (results) {
        results.save(null, {
          success: function (results) {
            // Now let's update it with some new data. In this case, only cheatMode and score
            // will get sent to the cloud. playerName hasn't changed.
            results.set("coupon", true);
            results.set("couponUsedDate", new Date());
            results.save();
            // alert('Validated');
            _this.getComments();
          }
        });
      },
      error: function (error) {
        alert("Error: " + error.code + " " + error.message);
      }
    });
  }