php - Slim - Swift Mailer on the route is work but if after moved on controller get errors -

i add libraries slimcontroller , swift mailer in slim project, when in route goes well:

route::get('/send', function() use ($app, $mailer) {  $message = swift_message::newinstance('activation code')                 ->setfrom(array('xxx@gmail.com' => 'xxx'))                 ->setto(array('xxxs@gmail.com' => 'xxxs'))                 ->setbody('test');  // send message $results = $mailer->send($message);  // print results, 1 = message sent! print($results); }); 

but after run on controller there error

class mycontroller extends \slimcontroller\slimcontroller {      public function getregisters()     {         $data = (empty(\session::flash())) ? array(             'token' => \token::gettoken()         ) : array_merge(\session::flash(), array(             'token' => \token::gettoken()         ));          return $this->render('auth/register.html', $data);     }     public function postregisters()     {         $message = swift_message::newinstance('activation code')->setfrom(array(             'xxx@gmail.com' => 'xxx'         ))->setto(array(             'xxxs@gmail.com' => 'xxxs'         ))->setbody('test');          // send message         $results = $this->app->mailer->send($message);     } } 

fatal error: call member function send() on non-object in.
reference fortrabbit/slimcontroller

i'm guessing here (since don' have full controller code) controller's $this->app empty. slim won't inject $app object in controllers.

there several ways inject dependencies slim. i'm not entirely sure what's best practice here. i'd start looking here.

also, can nasty hack in controllers __construct. although don't recommend it, like:

class controller {     protected $app;     public function __construct()     {          $this->app = \slim\slim::getinstance();     } } 

if sure controller have $app property, problem how inject $mailer instance. see routes, you're passing both $app , $mailer closure.

you can inject mailer object app singleton. code should like:

$app->mailer = function() {    $mailer = new whatevermaileryouareusing();    // ...config stuff...     return $mailer; };