Databases
StackOverflow2013
Postsdbo
POMongodb find() method freezes over Nodejs
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POMongodb find() method freezes over Nodejs
    primarykey
    data
    text
    <p>I'm starting webapps development with Node, so I'm quite new with this technology.</p> <p>I've done several examples and managed to make it run.</p> <p>However, now I'm trying to use Mongodb but I'm not able to make it run properly. It seems that the connection is working but when I call the find() method and I go to localhost:3000/near (which is the url that makes the findAll docs), the browser spends about a half a minute loading and finishes returning nothing (<strong>ERR_EMPTY_RESPONSE</strong>).</p> <p>This is my code:</p> <p>app.js</p> <pre><code>app.get('/near', function(req, res){ server.findAll( function(error,docs){ res.render('near', { title: 'Cerca tuyo!', places:docs }); }) }); </code></pre> <p>And this my Server.js</p> <pre><code>//constructor AppServer = function(host, port) { this.db= new Db('node-mongo-places', new Server(host, port, {safe: false}, {auto_reconnect: true}, {})); this.db.open(function(){}); }; //Devuelve la colección de "places" AppServer.prototype.getCollection= function(callback) { this.db.collection('places', function(error, places_collection) { if( error ) callback(error); else callback(null, places_collection); }); }; //Devuelve todos los contenidos de la DB places AppServer.prototype.findAll = function(callback) { this.getCollection(function(error, places_collection) { if( error ) callback(error) else { places_collection.find().toArray(function(error, results) { if( error ) callback(error) else callback(null, results) }); } }); }; </code></pre> <p>I have debugged the code writing console.log() and it seems that it does not reach to the callback function from <code>places_collection.find().toArray(function(error, results) {</code></p> <p>Any idea why the server does not return anything?</p> <hr> <h2><strong>!!! EDIT:</strong></h2> <p>I found some piece of code to test if the connection to mongodb is alright and it says that it's not: <code>[Error: failed to connect to [localhost:27017]]</code></p> <p>So the problem is in the connection. Should I run mongodb first? I thought that the app.js itself would did that for me!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USIbai
    1. USIbai
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COCouldn't it be that `places_collection` is very large and it takes too much time to load it? `toArray` needs to load it into memory entirely. Your code seems to look okay.
      singulars
      1. POMongodb find() method freezes over Nodejs
      1. USrobertklep
    2. CONop robertklep. In fact, it's being created, I have never inserted any doc to the DB. I can't see where is the bug.
      singulars
      1. POMongodb find() method freezes over Nodejs
      1. USIbai
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload