Redirection from ZEND framework 2 Controller's Constructor

Question

I want to check for user id in the constructor of my ZF2 Controller and if it is not defined then want to redirect to any external URL or to other controller I have tried:

$this->redirect()->toRoute("campaign");

and

$this->redirect()->toUrl("http://example.com");

Both approaches give me the same error message:

Url plugin requires that controller event compose a router; none found

Answer 1

Service Locator is not present in the Controller's constructor, but you can override onDispatch method inherited from AbstractActionController. Use it like this:

public function onDispatch(\Zend\Mvc\MvcEvent $e)
    {
        $session = new \Zend\Session\Container('base');
            if(!$session->offsetExists('id'))
            $this->redirect()->toRoute("campaign"); and $this->redirect()->toUrl("http://example.com")

        return parent::onDispatch($e);
    }