javascript - Bluebird Promise.all 回调错误

Question

我尝试使用 Promise.all() 处理数组，但我不能，这是代码:

此函数请求 IMDB 信息

module.exports = {

info: function(name, fn){

  var MovieDB = require("moviedb")("470fd2ec8853e25d2f8d86f685d2270e"),
    path = require("path");

  var rex = /([a-z]*\b(?:m2ts|mp3|sub|spanish|english|french|brrip|gaz|yify|avi|mp4|mkv|bdrip|dvdrip|dvdscr|dvdscreener|screener|dvdrip|r5|telesync|480p|480i|576p|576i|720p|720i|1080p|1080i|hrhd|hrhdtv|hddvd|bluray|x264|h264|xvid|ac3|dts|aac))/ig
  name = path.basename(name)
  name = name.replace(rex, "");

  var regexNameYear = /(.+?)\W?(\d{4})[^1080|720]/ig;
  var tvShowPattern = /(s[0-9][0-9])|(se[0-9][0-9])|(season\.[0-9])|(season [0-9])|(season[0-9])|(season [0-9][0-9])|([0-9]x)/ig;
  var year = /(\d{4})/g

  var hasYear;
  var yearFile;

  if(name.match(/\d{4}/g)){
    yearFile = name.match(/\d{4}/g);
    yearFile = yearFile[0];
    hasYear = true;
  }

  mov = name.match(regexNameYear);

  if(mov != null){
    mov = mov[0].replace(/\./g, " ");
    mov = mov.replace(/(\d{4})/g, "")
  }else{
    mov = name.match(/([A-Z])\w+/ig);
    mov = mov.join(" ");
  }

  var p

  MovieDB.searchMulti({query: mov }, function(err, res){

    var info = res.results[0]

    if(info != undefined){

      p = { id: info.id,
             backdrop_path: info.backdrop_path,
             original_title: info.original_title,
             poster_path: info.poster_path,
             popularity: info.popularity
           }

    return fn(err, p)
   }
  });
 }
}

在这里我尝试使用 promise :

var arp = []
arp.push(posters.info('american.horror.story.2014.s03e01.bitchcraft.720p.web-dl.sujaidr.mkv')
arp.push(posters.info('Autómata.2014.720p.BluRay.x264.YIFY.mp4'))
arp.push(posters.info('Evil.Dead.2013.720p.BluRay.x264.YIFY.mp4'))
arp.push(posters.info('Deliver.Us.from.Evil.2014.720p.BluRay.x264.YIFY.mp4'))
arp.push(posters.info('Falling.Skies.2013.S01E01E02.720p.HDTV.x264.mkv'))


Promise.all(arp).then(function(p){
  console.log(p);
})

但我有这个结果:

movieInfo.js:56
    return fn(err, p)
           ^
TypeError: undefined is not a function

我做错了什么？

问候。

Answer 1

如果您想使用 Promise，请不要再使用回调函数。从您的 info 方法返回一个 Promise，而不是采用 fn! (这也是 Promise.all 所期望的，一组 Promise)

所以promisify你的库:

var Promise = require("bluebird"),
    MovieDB = Promise.promisiyAll(require("moviedb")("470fd2ec8853e25d2f8d86f685d2270e"));
module.exports = {
  info: function(name) {
    …
    return MovieDB.searchMultiAsync({query: mov})
//  ^^^^^^                    ^^^^^
    .then(function(res) {
      var info = res.results[0]
      if (info != undefined)
        return {
          id: info.id,
          backdrop_path: info.backdrop_path,
          original_title: info.original_title,
          poster_path: info.poster_path,
          popularity: info.popularity
        };
    });
  }
}