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我在重构一些代码以使用 Promises 时遇到问题,这是为了避免嵌套回调,我试图重构的代码如下所示:

bot.api.users.list({}, function(err, teamData) {
if(err) {
  bot.botkit.log("Couldn't fetch team data from API", err);
  return;
}

var members = teamData.members;
var msgSender = _.find(members, function(member) { return member.id == message.user });

parsedUserIds(userIdsGroup).forEach(function(id) {
  var msgReceiver = _.find(members, function(member) { return member.id == id });

  bot.startPrivateConversation({ user: id }, function(err, conversation) {
    if(err) {
      bot.botkit.log("Couldn't initiate private conversation", err);
      return;
    }

    var message = format("Hey {to}, {from} just requested a Pull Request Review, here's the link: {githubLink}, please go and check it out!", 
                         { to: msgReceiver.name,
                           from: msgSender.name,
                           githubLink: githubRepoUrl });

      conversation.say(message);
  });
});

我将 botkit 与 slack api 一起使用,并将 bluebird 用于 Promises。

我最麻烦的代码部分是循环遍历每个 id 并开始与用户的私人对话;我一直在尝试的看起来像这样:

  var usersList = Promise.promisify(bot.api.users.list);
  var privateConversation = Promise.promisify(bot.startPrivateConversation);

  usersList({}).then(function(data) {
    var members = data.members;
    var msgSender = findMember(members, message.user);

    return Promise.all(parsedUserIds(userIdsGroup).map(function(id) {
      var msgReceiver = findMember(members, id);

      return privateConversation({ user: id }).then(function(conversation) {
        var message = format("Hey {to}, {from} just requested a Pull Request Review, here's the link: {githubLink}, please go and check it out!", 
                             { to: msgReceiver.name,
                               from: msgSender.name,
                               githubLink: githubRepoUrl });
        conversation.say(message);
      });
    }));
  }).catch(function(err){
    bot.botkit.log(err);
  });

据我了解, Promise.all 允许我从一系列承诺中获得结果......但是,我从这段代码中得到了一个错误:TypeError: this.task.bot.reply is not a function这根本没有帮助我。

我如何使用承诺来完成我想要做的事情?

4

1 回答 1

2

Promise.all 允许我从一系列承诺中得到结果

Promise.all 返回一个 Promise,一旦你传入的所有 Promise 都实现了,它就会实现。所以你需要做的就是调用then

Promise.all(parsedUserIds(userIdsGroup).map(function(id) {/*return promise here*/}))
.then(function(results) { console.log(results); })
于 2016-06-04T07:48:04.527 回答