promise_volt.rb

# Callback hell :/
Yelp.get("restaurants").then do |response|
  PlacesTasks.sort(response.json[:places]}) do |response|
    Place.review(response, {ranking: -1}) do |response|
      puts "All finished"
    end
  end
end

# More readable asynchronous calls with Promises 
Yelp.get("restaurants").then do |response|
  PlacesTasks.sort(response.json[:places]})
end.then do |response|
  Place.review(response, {ranking: -1})
end.then do
  puts "All finished"
end