Database: Mongodb

install mongo extension sudo pecl install mongo

configuration in configs.php

'components' => [
    'mongo' => 'Mongo', [
        'collections' => [
            'users','articles' => [
                'url' => 'mongodb://10.0.1.1:27017,10.0.1.2:27017',
                'database'=> 'production',
                'options' => [
                    'replicaSet'=> 'rs0',
                    'readPreference' => \MongoClient::RP_SECONDARY_PREFERRED,
                ],
            ],
            'logs.errors' => [
                'url' => 'mongodb://10.0.2.1:27017',
                'database'=> 'production',
            ],
        ]
    ],
],

query

/**
 * @param string $id
 */
$app->get('/user/:id', function($id) {
    if($user = $this->mongo->users->findOne($id)) {
        return $user;
    } else {
        return 404;
    }
});

accessing a collection with a dot in name

$this->mongo['logs.errors']->insert($data);

GridFS

'components' => [
    'attachments' => 'MongoGridFS', [
            'url'        => 'mongodb://localhost:27017',
            'database'   => 'project',
        ]
    ],
],

$app->post('/attachment', function() {
    $this->gfs->storeUpload('attachment');
});