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Experimenting with Node.js and MongoDb and Mongoose

I came across Mongoose for Node.js. It looks like a promising project but I ran into a bug as soon as I started playing with a simple counter program. The problem is in the implementation QueryPromise's atomic functions. Here is a sample program that updates a counter. The three update forms below should all be identical, only the first seems to work with the version I was playing with.

// Simple test program to show a problem in QueryPromise
// ['inc','set','unset','push','pushAll','addToSet','pop','pull','pullAll']

var sys = require('sys')
var mongoose = require('mongoose/').Mongoose
var db = mongoose.connect('mongodb://localhost/test');

var Simple = mongoose.noSchema('test',db);
//should only be one....
var m = new Simple({name:'test', x:0,y:0}).save()
// these should behave the same
Simple.update({name:'test'},{'$inc':{x:1, y:1}}).execute();
Simple.update({name:'test'}).inc({x:1, y:1}).execute();

     function (doc) {
    function(){ // promise (execute after query)
        Simple.close(); // close event loop

Here is a fixed version of QueryPromise's atomic functions that place the command and arguments in the correct place.

// atomic similar

      QueryPromise.prototype[cmd] = function(modifier){
        if( != 'u') return this;
        if(!this.op.args.length) this.op.args.push({},{});
        if(this.op.args.length == 1) this.op.args.push({});
        for(i in modifier) {
          if(!(this.op.args[1]['$'+cmd] instanceof Object)) this.op.args[1]['$'+cmd] = {};
          this.op.args[1]['$'+cmd][i] = modifier[i];
        return this;

Running Apple Mac OSX, and your system.log is filling up with

mdworker[473]: Unable to use font: no glyphs present.

/System/Library/Frameworks/ApplicationServices.framework /Frameworks/ATS.framework/Support/ATSServer[474]: Serious problems were found in font data while activating it.

/System/Library/Frameworks/ApplicationServices.framework /Frameworks/ATS.framework/Support/ATSServer[474]: You may encounter drawing or printing problems.

Well, it could be Spotlight trying to index a bad PDF file. To find the offending file with use lsof and the process id of the mdworker process

  lsof -p 473

In my case it was a PDF from the hadoop 20.0 release

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