Mongo database

Setup connection

Before we start using MongoDB in our project, we have to setup a connection details, by adding them to app/config/config.php file:

//...
'mongo' => [
    'dbname' => 'test'
],
//...

Create provider

To make MongoDB available in the application, you have to create a service provider

use Phalcon\DiInterface;
use Vegas\DI\ServiceProviderInterface;
use Phalcon\Mvc\Url as UrlResolver;

class MongoServiceProvider implements ServiceProviderInterface
{
    const SERVICE_NAME = 'mongo';

    /**
     * {@inheritdoc}
     */
    public function register(DiInterface $di)
    {
        $di->set(self::SERVICE_NAME, function() use ($di) {
            $mongo = new \MongoClient();
            return $mongo->selectDb($di->get('config')->mongo->db);
        }, true);
    }

    /**
     * {@inheritdoc}
     */
    public function getDependencies()
    {
        return [
            CollectionManagerServiceProvider::SERVICE_NAME
        ];
    }
}

Note that Mongo service provider requires CollectionManagerServiceProvider, which also has to be registered manually, as follows:

use Phalcon\DiInterface;
use Vegas\DI\ServiceProviderInterface;
use Phalcon\Mvc\Url as UrlResolver;

class CollectionManagerServiceProvider implements ServiceProviderInterface
{
    const SERVICE_NAME = 'collectionManager';

    /**
     * {@inheritdoc}
     */
    public function register(DiInterface $di)
    {
        $di->set(self::SERVICE_NAME, function() use ($di) {
           return new \Phalcon\Mvc\Collection\Manager();
        }, true);
    }

    /**
     * {@inheritdoc}
     */
    public function getDependencies()
    {
        return [];
    }
}

Create model

Once we have a MongoDB setup in application, we can start creating a data-models.
Create a file Foo.php in the models directory in one module.

namespace Foo\Models;

use Vegas\Db\Decorator\CollectionAbstract;

class Fo extends CollectionAbstract
{
    /**
     * Returns the name of Mongo collection
     */
    public function getSource()
    {
        return 'foo_collection';
    }
}

For more information about ODM check the following link.