如何等待所有异步调用完成 [英] How to wait for all async calls to finish

问题描述

我将Mongoose与Node.js结合使用，并具有以下代码，这些代码将在所有save()调用完成后调用回调.但是，我认为这是一种非常肮脏的方式，并且希望了解完成此操作的正确方法.

I'm using Mongoose with Node.js and have the following code that will call the callback after all the save() calls has finished. However, I feel that this is a very dirty way of doing it and would like to see the proper way to get this done.

function setup(callback) {

  // Clear the DB and load fixtures
  Account.remove({}, addFixtureData);

  function addFixtureData() {
    // Load the fixtures
    fs.readFile('./fixtures/account.json', 'utf8', function(err, data) {
      if (err) { throw err; }
      var jsonData = JSON.parse(data);
        var count = 0;
        jsonData.forEach(function(json) {
          count++;
          var account = new Account(json);
          account.save(function(err) {
            if (err) { throw err; }
            if (--count == 0 && callback) callback();
          });
        });
    });
  }
}

推荐答案

您可以使用步骤.

此外，我已经编写了一个小模块，可以为您处理装载夹具，因此您只需执行以下操作:

Also, I've written a small module that handles loading fixtures for you, so you just do:

var fixtures = require('./mongoose-fixtures');

fixtures.load('./fixtures/account.json', function(err) {
  //Fixtures loaded, you're ready to go
};

Github: https://github.com/powmedia/mongoose-fixtures

它还将加载灯具文件或对象的目录.

It will also load a directory of fixture files, or objects.

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