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POWhy does this simple Mongoose.js program freeze while doing a 'nested' save?
 

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  1. POWhy does this simple Mongoose.js program freeze while doing a 'nested' save?
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    <p><strong>[edit]: I updated the previous question with this, using a very specific reproducible example.</strong></p> <p>This is my entire program. <br><br> I create two Schemas <code>ASchema</code> and <code>BSchema</code> with collections <code>A</code> and <code>B</code> respectively, make two objects <code>a</code> and <code>b</code>, and attempt to save them sequentially - that is, first <code>a</code> then <code>b</code>.</p> <pre><code>mongoose = require('mongoose'), Schema = mongoose.Schema; mongoose.connect('mongodb://localhost/test'); ASchema = new Schema({ text: String }); BSchema = new Schema({ val: Number }); A = mongoose.model('A', ASchema); B = mongoose.model('B', BSchema); a = new A({text: 'this is a'}); b = new B({val: 5}); a.save(function(err) { if(err) console.log(err.message); else { console.log('saved a : ', a); b.save(function(err) { if(err) console.log(err.message); else { console.log('saved b : ', b); } }); } }); mongoose.disconnect(); </code></pre> <p><strong>What I expect should happen:</strong> <br>It should print <code>saved a :</code> followed by the document a, and then <code>saved b :</code>, followed by the document b.<br><br> <strong>What actually happens:</strong> <br>It prints <code>saved a : { text: 'this is a', _id: 4ee4cab00d2c35fc04000001 }</code> and nothing more. The program does not stop either; it stays 'stuck'.<br> Looking through the mongo shell, I find that a collection <code>as</code> (<code>a</code> pluralized by mongoose, that is okay) has been created, and I can see saved document in it with <code>db.as.find()</code>. However, I cannnot find a collection <code>bs</code>.<br><br> <strong>Tweak:</strong> <br>In the saving code, swapping the places of <code>a</code> and <code>b</code> (order of saving) causes <code>b</code> to be saved, and <code>a</code> to not be saved. So the problem is not specifically with <code>a</code> or <code>b</code>.<br><br> <strong>Question:</strong> Why does it not save the next document?</p>
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    1. COThe error doesn't seem to be from this code, which looks perfectly ok. I think there may be an error with agent or something like that. Can you console.log it?
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    2. COIt's not a problem with the person/agent, because swapping their places in the code causes the same effect - it always hangs when saving the 'inner' thing.
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    3. COedited the example with something more general, can be tested by anyone.
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