sequential promise chain with array of data, how to resolve the promise chain?

Question

I am using kriskowal q implementation.

I have an array of data objects, each with an id.

I need to chain these sequentially into promises because I am abiding to rate limiting rules by setting it to 1 request per second.

However, I am having trouble resolving the promises and my function stalls. Ie I see the ouput of addVideo, getInfo, retryIfNeeded and a delay of 1 second for the very first video, but I don't see any of that for any subsequent videos.

What I want to do is after the delay, to resolve that chain so that the next list of promises continues on the second Video ID.

How do I do this? What am I doing wrong? I've searched a lot on google but haven't found a solution so any suggestions is welcome

Edit added jsfiddle: http://jsfiddle.net/gpa7ym18/4

var promiseChain = data.items.reduce(function(promise, video) {
  video.type = type;
  return promise
         .then(addVideo)
         .then(getInfo)
         .then(retryIfNeeded)
         .then( function() {
            return q.delay(1000)
                   .done(function() {
                        NEED TO RESOLVE HERE but there is NO Defered object
                        to set defer.resolve. How do I resolve this promise chain?
                   });
         });
   }, q.resolve(data.items[0]));

Answer 1

You don't need to resolve anything.

You should simply return the delayed promise, and that will become the value of the entire chain.
This is exactly how promise chaining works.