javascript - Node.js Async Promises within a forEach Loop inside another then statement -

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i have been trying understand promises nesting simple code.

both functions i'm calling async, 1 giving entire collection , other individual information of each of elements.

what doing wrong?

const piratebay = require ('thepiratebay'); var os = require ('os'); var sys = require('util'); var util = require('util'); var cfg = require('./config/appconf.js'); var mysql = require('mysql'); var torrent = require('./models/torrent.js'); var parsetorrent = require('parse-torrent')  var async = require('async'); function saveresults (results) {     console.log( "save results");     var ctorrents = [];     (var key in results) {         var t =results[key];         var torrent = new torrent()         torrent.id = t.id;         torrent.name =  t.name;         torrent.size = t.size;         torrent.seeders = t.seeders;         torrent.leechers = t.leechers;         torrent.verified = t.verified;         torrent.uploader = t.uploader;         torrent.category = t.category.name;         torrent.description = t.description;         torrent.subcategory = t.subcategory.name;         var r = parsetorrent (t.magnetlink);         torrent.announce = r.announce;         torrent.hash = r.infohash;         ctorrents.push (torrent);     }     return ctorrents; } piratebay     .recenttorrents()     .then( function(results){          var ltorrents = saveresults(results);           async.each (ltorrents,function (t,next){                 await piratebay                     .gettorrent(t.id)                     .then(function (err, doc){                         console.log(doc.description);                         t.doc = doc.description;                         next();                     });          },function (err) {             console.log ("whneeeee");             console.log(ltorrents);          });          console.log(ltorrents);     })     .catch (function (err){         console.log(err);     });

you don't need async module, promise should sufficient. in particular might interested in promise.all() takes array of promises , resolves when promises finishes. using array.prototype.map() each element of ltorrents can mapped promise. here's example..

piratebay         .recenttorrents()         .then(function(results){              var ltorrents = saveresults(results);              return promise.all(ltorrents.map(function(t) {                  return piratebay.gettorrent(t.id)                      .then(function(doc) {                          t.doc = doc.description;                          return t;                      })                      .catch(function(err) {                          // if 1 request fails, whole promise.all() rejects,                           // can catch ones fail , instead...                          t.doc = "unavailable (because gettorrent failed)";                          return t;                      });              }));         })         .then(function(ltorrents) {             // gota do..         })

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