Looking for Mongoose “hello world” example

Question

Update: Been some time. But back then decided not to use Mongoose. Main reason being that we couldn't really come up with a great reason for using an ORM when using mongo and javascript.

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I've been trying to create a database/model with Mongoose which is basically just a user database where the username is unique. Sounds simple enough, but for some reason I've been unable to do so.

What I've got so far is this:

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

mongoose.model('User', {
    properties: [
        'name',
        'age'
    ],

    cast: {
        name: String,
        age: Number
    },

    //indexes: [[{name:1}, {unique:true}]],
    indexes: [
        'name'
    ]
    /*,
    setters: {},
    getters: {},
    methods: {}
    */
});    

var User = db.model('User');

var u = new User();
u.name = 'Foo';

u.save(function() {
    User.find().all(function(arr) {
        console.log(arr);
        console.log('length='+arr.length);
    });
});
/*User.remove({}, function() {});*/

It just doesn't work. The database is created alright, but the username is not unique. Any help or knowledge of what I'm doing wrong?

Answer 1

You need to define the schema. Try this: (

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

mongoose.model('User', new Schema({
    properties: [
        'name',
        'age'
    ],

    [...]
}));    

Answer 2

For Mongoose 2.7 (tested in Node v. 0.8):

var mongoose = require('mongoose'),
    Schema = mongoose.Schema;

var db = mongoose.connect('mongodb://localhost/db');

var User = new Schema({
  first_name: String,
  last_name: String
});

var UserModel = mongoose.model('User', User);

var record = new UserModel();

record.first_name = 'hello';
record.last_name = 'world';

record.save(function (err) {

  UserModel.find({}, function(err, users) {

    for (var i=0, counter=users.length; i < counter; i++) {

      var user = users[i];

      console.log( "User => _id: " + user._id + ", first_name: " + user.first_name + ", last_name: " + user.last_name );

    }

  });

});

Answer 3

Try giving right path in var mongoose = require('mongoose').Mongoose,

. It worked for me..

#

my code

require.paths.unshift("/home/LearnBoost-mongoose-45a591d/mongoose");
var mongoose = require('mongoose').Mongoose;


var db = mongoose.connect('mongodb://localhost/db');


 mongoose.model('User', {
            properties: ['first name', 'last name', 'age', 'marriage_status', 'details', 'remark'],


});

var User = db.model('User');
var record = new User();

record.first name = 'xxx';
record.last name = 'xxx';
record.age = 'xxx';
record.marriage_status = 'xxx';
record.details = 'xxx';
record.remarks = 'xxx';

record.save(function() {
User.find().all(function(arr) {

   console.log(arr); 
   console.log('length='+arr.length);



});

}); 


//User.remove({}, function() {});

Compile it with node filename.js good luck..

Answer 4

You should define your unique indexes before running your app for the first time. Otherwise, you need to drop your collection and start over. Also, mongoose will not throw an error when you attempt to save { name: 'user1' } when 'user1' already exists.

Answer 5

Learnboost recently uploaded a set of examples https://github.com/LearnBoost/mongoose/tree/master/examples