How to use promise to avoid callback hell? [duplicate]

Answer 1

Here's a somewhat shorter version

Posts.findOne({id: id}).then(function (post) {
  var query1 = Comments.find({id: post.id});
  var query2 = Links.find({id: post.id});

  Promise.all(query1.exec(), query2.exec()).then(function(data) {
     res.json({ post: post, comments: data[0], links: data[1] });
  });
});