Ember chained promises

I have a problem that I know is not very challenging. But for some reason, I am having difficulty coming up with a good solution. I need to fetch data from a URL. The URL itself, however, is fetched from another end-point. So, first I fetch an object containing the URL from the server. Upon getting the URL, I access the fetched URL which finally gives me the data I need. The data contains further URLs which I eventually have to fetch. How do I fetch all these data from model hook of ember route?