在forEach内部进行异步调用 [英] make async call inside forEach
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问题描述
我正在尝试遍历对象数组,并使用Node.js中的异步功能在这些对象内添加一些东西.
I am trying to iterate thru array of objects and add some stuff inside these objects using async function in Node.js.
到目前为止,我的代码如下:
So far my code looks like:
var channel = channels.related('channels');
channel.forEach(function (entry) {
knex('albums')
.select(knex.raw('count(id) as album_count'))
.where('channel_id', entry.id)
.then(function (terms) {
var count = terms[0].album_count;
entry.attributes["totalAlbums"] = count;
});
});
//console.log("I want this to be printed once the foreach is finished");
//res.json({error: false, status: 200, data: channel});
如何在JavaScript中实现这种目标?
How can I achieve such a thing in JavaScript?
推荐答案
使用 async.each
async.each(channel, function(entry, next) {
knex('albums')
.select(knex.raw('count(id) as album_count'))
.where('channel_id', entry.id)
.then(function (terms) {
var count = terms[0].album_count;
entry.attributes["totalAlbums"] = count;
next();
});
}, function(err) {
console.log("I want this to be printed once the foreach is finished");
res.json({error: false, status: 200, data: channel});
});
处理完所有条目后,将调用最终回调.
The final callback will be called when all entries are processed.
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