Symfony2 set class variable with init or construct methods - symfony

Question

Have recently been using Symfony2 after using ZF for some time.
I am having problems trying to do something relatively simple, I think.
The following code is within a controller:
private $current_setid = "";
public function __construct() {
$current_set = $this->getCurrentSet();
if ($current_set == "") {
return $this->redirect($this->generateUrl('selectset'));
}
$this->current_setid = $current_set;
}
public function getCurrentSet() {
$session = $this->get("session");
$set = $session->get('set');
return $set;
}
public function setCurrentSet($setid) {
$session = $this->get("session");
$session->set('set', "$setid");
}
If I use __construct() I get errors like:
Fatal error: Call to a member function get() on a non-object in
I have tried using __init() and init() both of which do not seem to get called.
Can anyone point me in the right direction? Is there a simple way to do this or do I have to look into event listeners?

Answer 1

Have you tried getting your session like they do in official documentation?
$session = $this->getRequest()->getSession();
$foo = $session->get('foo');

Answer 2

Basically get fetch dependencies from container and container in the Controller is injected using setter dependency injection. You just not have container in the time of __construct yet.

Answer 3

Just ended up opting for placing a check in every method in the class. Seems silly to have to do that but I find I often have to do that in Symfony2 with the lack of init, postDispatch type methods like ZF has.
Even trying to remove the check to another method was counter productive as I still had to check the return from that method as $this->redirect does not seem to work unless it is within an Action method. For example:
public function isSetSet() {
$current_set = $this->getCurrentSet();
if ($current_set == "") {
$url = $this->generateUrl('selectset');
return $this->redirect($url);
}
return TRUE;
}
public function someAction() {
$check = $this->isSetSet();
if($check != TRUE){
return $check;
}
...
}
So each method needs that 4 line check but the whole check can be done in 4 lines anyway so no need for that extra method:
public function anotherAction() {
$current_setid = $this->getCurrentSet();
if ($current_setid == "") {
return $this->redirect($this->generateUrl('selectset'));
}
...
}