example.js

/**
 * Created by mwmaleks on 31.10.13.
 */
var mongoose = require('mongoose');
console.log('Версия монгуса -', mongoose.version);

var db = mongoose.createConnection('mongodb://localhost/learn');
db.on("error", console.error.bind(console, "connection error:"));
db.once("open", function callback () {
    console.log("Connected!")
});

function validator (number_id, Cert_schm) {
    console.log('а я тут много разззззззззз');
    return  Cert_schm.find({number_id: number_id}, function (err, certificates) {
                console.log(certificates);
        console.log('и туттттттттттттттттт');
                return true;
            });
};

var CertificateSchema =  new mongoose.Schema({

    number_id:{
        sp1: { type: String, max: 4},
        sp2: { type: String, max: 4},
        sp3: { type: String, max: 4},
        sp4: { type: String, max: 4}
    },
    instructor_id: { type: String, max: 24}
});
CertificateSchema.methods.validate_number = function(Cert_schm, number) {

    if (Cert_schm.find({number_id: number}, function () {}) !== {}) return false;
    else return true;
};

CertificateSchema.methods.new_cert = function (Cert_schm) {
    var _4sl_number = function () {
        var a = '';
        for ( var i = 0; i < 4; i++ ) {
            var b = Math.floor( Math.random( ) * (10) );
            a += b.toString();
        }
        return a;
    };
    do {
        this.number_id = {
            sp1: _4sl_number(),
            sp2: _4sl_number(),
            sp3: _4sl_number(),
            sp4: _4sl_number()
        };
        Cert_schm.find({number_id: this.number_id}, function(err, results){
            if (results === undefined) {}
        });
        //this.save(function (err, certificate) {
        //    if (err)
        //        console.log("Something goes wrong with certificate " + certificate);
        //});

    } while (this.validate_number(Cert_schm, this.number_id));

};

var Certificate = db.model("Certificate", CertificateSchema);

var certificate = new Certificate();

certificate.new_cert(Certificate);