fruitstand/examples/nodejs-mongodb-angularjs-web-development/ch16/mongoose_update_many.js

fruit stand

var mongoose = require('mongoose');
var db = mongoose.connect('mongodb://localhost/words');
var wordSchema = require('./word_schema.js').wordSchema;
var Words = mongoose.model('Words', wordSchema);
mongoose.connection.once('open', function(){
  Words.find({word:/grati.*/}, function(err, docs){
    console.log("Before update: ");
    for (var i in docs){
      console.log(docs[i].word + " : " + docs[i].size);
    }
    var query = Words.update({}, {$set: {size: 0}});
    query.setOptions({multi: true});
    query.where('word').regex(/grati.*/);
    query.exec(function(err, results){
      Words.find({word:/grat.*/}, function(err, docs){
        console.log("\nAfter update: ");
        for (var i in docs){
          console.log(docs[i].word + " : " + docs[i].size);
        }
        mongoose.disconnect();
      });
    });
  });
});