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Mongoose I

Mongoose


Mongoose is an ODM

  •  Object Data Model
Generate a schema to order the documents in MongoDB


Install

To install mongoose in your project, type:
  • npm install mongoose --save


Create a Model

All this code will be in a file <Model>.js to create a Model and be used as node package

// grab the things we need
var mongoose = require('mongoose');
var Schema = mongoose.Schema;

// create a schema
var dishSchema = new Schema({
    name: {
        type: String,
        required: true,
        unique: true
    },
    description: {
        type: String,
        required: true
    }
}, 

//This part creates two date fields to store when a field is created and when is updated 

{
    timestamps: true
});

// the schema is useless so far

// we need to create a model using it

 The model always will be in plural

var Dishes = mongoose.model('Dish', dishSchema);


// make this available to our Node applications
module.exports = Dishes;


Implementing the Model

First Approach

var mongoose = require('mongoose'),
    assert = require('assert');

var Dishes = require('./models/dishes-1');

// Connection URL
var url = 'mongodb://localhost:27017/conFusion';
mongoose.connect(url);
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function () {
    // we're connected!
    console.log("Connected correctly to server");

    // create a new user
    var newDish = Dishes({
        name: 'Uthapizza',
        description: 'Test'
    });

    // save the user
    newDish.save(function (err) {
        if (err) throw err;
        console.log('Dish created!');

        // get all the users
        Dishes.find({}, function (err, dishes) {
            if (err) throw err;

            // object of all the users
            console.log(dishes);
                        db.collection('dishes').drop(function () {
                db.close();
            });
        });
    });
});

Second Approach

var mongoose = require('mongoose'),
    assert = require('assert');

var Dishes = require('./models/dishes-1');
// Connection URL
var url = 'mongodb://localhost:27017/conFusion';
mongoose.connect(url);
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function () {
    // we're connected!
    console.log("Connected correctly to server");
    // create a new dish
    Dishes.create({
        name: 'Uthapizza',
        description: 'Test'
    }, function (err, dish) {
        if (err) throw err;
        console.log('Dish created!');
        console.log(dish);

        var id = dish._id;

        // get all the dishes
        setTimeout(function () {
            Dishes.findByIdAndUpdate(id, {
                    $set: {
                        description: 'Updated Test'
                    }
                }, {

//If value es true, the function will update the register and then back the object
//If false then the register will be back and then updated

                    new: true
                })
                .exec(function (err, dish) {
                    if (err) throw err;
                    console.log('Updated Dish!');
                    console.log(dish);

                    db.collection('dishes').drop(function () {
                        db.close();
                    });
                });
        }, 3000);
    });
});

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