Parse.com —云代码/ JS —“无法调用未定义的方法'set'”

Question

So, my Javascript isn't the best but I have to venture into it to run some Cloud Code functions. I have the following:

Parse.Cloud.define("setCommentIsTitle", function(request, response) {
  Parse.Cloud.useMasterKey();

  var query = new Parse.Query("Comment");
  query.equalTo("objectId", request.params.objectId);

  query.first({
      success: function(object) {

          object.set('isTitle', request.params.isTitle);
          return object.save();  },
      error: function(error) {
        alert("Error: " + error.code + " " + error.message);
  }
});

I logged the objectId I'm passing in as request.params.objectId and it's correct. What I don't get is that success is being called, but then I'm getting the following Cloud Code log when I console.log object:

I2013-10-21T17:27:52.120Z] object = undefined

And the following error returned in XCode:

code=141, error=TypeError: Cannot call method 'set' of undefined

If I'm calling the first function on query , and success is being called, shouldn't that mean there is an object returned? Why is object undefined?

Answer 1

OK, so this was a stupid error on my part, but also abetted by a confusing Parse error message.

My class is called Comments and not Comment , so I was looking up the wrong class. However, since success was called on the query I started looking in all the wrong places for the error.

Why would success be called if I'm querying a class that doesn't even exist??