Question

I’m very newbie on Javascript-NodeJS-MongoDB, I try to know the number of documents found by a query.

...
var page = req.params.page;  

var db = require('mongojs').connect('localhost:27017/foo', ['bar']); 

var docs = db.bar.find({x:'MME'}).sort({y:1}).skip(10*(page-1)).limit(10); 

var nbDocs = db.bar.find({x:'MME'}).count(); /*docs.count();*/

console.log(nbDocs);

But unfortunately the log gives me ‘undefined’, the same if I code

var nbDocs = docs.count();

Thank’s a lot for your precious help.

Gilles.

Answer 1

According to the docs the result will be in the second argument of the callback to the cursor.count() method. This might be a little more challenging to implement for somebody who’s new to javascript, but I think something like this should work:

docs.count(function(error, nbDocs) {
    // Do what you need the count for here.
});