Nested queries using javascript in cloud code (Parse.com)

Question

Is it possible to do nested queries in cloud code?

I want to be able to do something like

var adList = [];
var query2 = new Parse.Query(\"QR\");
var          


        

Answer 1

The second query is asynchronous so wrapping it in a for won't work.

response.success gets triggered before the second query finished so you are returning before actually waiting for the results. I would tell you to move response.success inside of the second success callback of query2 but that won't work either since you are running an async operation synchronously inside a for so you will send the response in the first success.

Don't run an async operation inside a loop. It doesn't work.

I'm not sure what you are trying to accomplish here but you'll have to instantiate a new Query for every call if you want to make as many queries as results.

Again, I'm not sure what is exactly you are trying to do but here is a way you can do something like that:

    var adList = [];
    var query = new Parse.Query("Campaigns");
    query.equalTo("isFeatured", true);

    query.find({
        success: function(results)  {
            var queries = [];

            for (var i=0; i

Bar in mind that Parse Cloud Code let you run code for aprox 5/7 seconds and this might be very slow if you have a lot of results. Btw, take a look a Parse's matchesQuery method.

Example taken from their docs:

    var Post = Parse.Object.extend("Post");
    var Comment = Parse.Object.extend("Comment");
    var innerQuery = new Parse.Query(Post);
    innerQuery.exists("image");
    var query = new Parse.Query(Comment);
    query.matchesQuery("post", innerQuery);
    query.find({
      success: function(comments) {
        // comments now contains the comments for posts with images.
      }
    });