[英]How to handle results of nested promises
我在重構某些代碼以使用Promises時遇到了麻煩,這是為了避免嵌套回調,我嘗試重構的代碼如下所示:
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);
});
});
我正在使用帶有松弛api的botkit和用於Promises的bluebird。
我最麻煩的部分是循環遍歷每個id並開始與用戶進行私人對話的循環。 我一直在嘗試看起來像這樣:
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);
});
據我了解,Promise.all允許我從一個promise數組中獲取結果...但是,我從以下代碼中得到了一個錯誤: TypeError: this.task.bot.reply is not a function
,不是根本無法幫助我。
我如何使用諾言來完成我想做的事情?
Promise.all可以讓我從一系列承諾中得到結果
Promise.all返回一個諾言,一旦您傳遞的所有諾言都兌現,該諾言就會實現。 所以,你需要做的是調用then
就可以了
Promise.all(parsedUserIds(userIdsGroup).map(function(id) {/*return promise here*/}))
.then(function(results) { console.log(results); })
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