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    <p>First, I recommend you to switch from your current <code>mongodb</code> module to something more comfortable, such as:</p> <ul> <li><a href="https://github.com/LearnBoost/monk" rel="nofollow">monk</a></li> <li><a href="https://github.com/kissjs/node-mongoskin" rel="nofollow">mongoskin</a></li> <li><a href="http://mongoosejs.com/" rel="nofollow">mongoose</a></li> </ul> <p>I'll be using <code>monk</code> in my example, by it may be easily adapted for any <code>mongodb</code> module, including <a href="https://github.com/mongodb/node-mongodb-native" rel="nofollow">native mongodb node driver</a>.</p> <p>As for your problem, you may solve it with any module for asynchronous control flow management, such as:</p> <ul> <li><a href="https://github.com/caolan/async" rel="nofollow">async</a></li> <li>most <a href="https://github.com/promises-aplus/promises-spec/blob/master/implementations.md" rel="nofollow">A+/promises</a>, e.g. <a href="https://github.com/cujojs/when" rel="nofollow">when.js</a></li> </ul> <p>Here's an example of solving your problem with <code>async.js</code>:</p> <pre><code>checkDialog: function (data, callback) { var db = require('monk')('localhost/messages'); var dialogsDb = db.get('dialog'); var interlocutorsArray = JSON.parse(data); async.concat(interlocutorsArray, function (item, next) { var query = { owner: item.owner_user_id viewer: item.viewer_user_id }; dialogsDb.find(query, function (err, docs) { if (err) return next(err); if (docs &amp;&amp; docs.length &gt; 0) { next(null, docs); } else { dialogsDb.insert(query, function (err, inserting) { next(err, [inserting]); }) } }) }, function (err, items) { if (err) throw err; // it's best to handle errors without throwing them var dialogsId = {}; for (var item, i = 0; i &lt; items.length; i++) { item = items[i]; dialogsId[item._id] = { owner: item.owner, viewer: item.viewer }; } callback(dialogsId); }) } </code></pre>
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    1. COYour answer is perfect! You've been very helpful to solve my problem! But, i do not quite understend your code. I would like to parse all in pieces. Не могли бы вы со мной связаться: romangorbatko(at)gmail.com. Thank you very much for your help!
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