Parse Cloud Code Save Not Performing.

Question

I was working on a piece of cloud code (Parse) for my IOS application and noticed that it wouldn't work whenever I tried to save the updated object. If I remove the save function, the code works and prints out the the success response, but if I keep it in I get the error:

Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

I've tried out a bunch of solutions and regardless of what they are, the error message above still gets printed from the X-Code debugger IF the save function is in the code. (If not then it prints the success response)

This is the code:

Parse.Cloud.define("removeFriend", function(request, response) {
Parse.Cloud.useMasterKey();
var userObjId = request.params.userObjId;
var currentUser = request.params.currentUser;
var query = new Parse.Query(Parse.User);
query.equalTo("objectId", userObjId);
//query.include('Friends');
query.find({
    success: function(results){
        var friendsArray = (results[0].get("Friends"));
        var newFriends = friendsArray.filter(function(x) {return x != currentUser});

        results[0].set("Friends", newFriends);
        results[0].save();
        response.success("THIS IS RESULT" + results[0].get("Friends"));



    },
    error: function(){
        response.error("The user was not successfully removed.");   

    }   
});

});

(I created a similar question with the same error earlier but have redone the code since then so I didn't want to mix the two questions up.)

Jake T. Jake T. · Accepted Answer · 2017-05-01T16:11:37

Saves are asynchronous, meaning they happen in a separate thread. You are returning with response.success() right after calling save(), so the save never completes before the function terminates.

You have two options: Add success / error options to the save() call, or use promises. I prefer the latter, it enables much cleaner code when you get the hang of them.

results[0].save().then(
    function( success ) {
        response.success("THIS IS RESULT" + results[0].get("Friends"));
    },
    function( error ) { 
        response.error("There was an error trying to save the object: " + JSON.stringify(error)); 
    }
);

Parse Cloud Code Save Not Performing.

1 Answers