php - Zend framework 2: redirect toRoute shortcircuit not triggering

Solution:

The act of calling$this->redirect() in your controller doesn't automatically redirect to a new location, it just returns aResponse object which you then need to return from your controller action in order to short circuit the request.

Since you're returning the result of theredirect() call from another function, you'll need to first test if the result of that call is aResponse object and handle it in your controller action...

<?php

namespace Blog\Controller;

use Zend\Mvc\Controller\AbstractActionController;
use Zend\Mvc\Controller\Plugin\FlashMessenger as FlashMessenger;

use Zend\Stdlib\ResponseInterface as Response;

class PostController extends AbstractActionController
{

    public function readAction()
    {
        $post_id = $this->params()->fromRoute('id');
        $post    = $this->validatePostId($post_id);

        // check to see if post validation returned a Response 
        if ($post instanceof Response) {
            // redirect...
            return $post;
        }

        return array(
            'post' => $post
        );
    }

    /**
     * Checks if $id from url is set and tries to find the corresponding post
     */
    public function validatePostId($post_id)
    {        
        if (!$post_id) {
            $this->flashMessenger()->addErrorMessage('Invalid post id');
            return $this->redirect()->toRoute('post');
        }

        $post = $this->getBlogService()->getPostById($post_id);

        if ($post == NULL) {
            $this->flashMessenger()->addErrorMessage('Invalid post id');
            return $this->redirect()->toRoute('post');
        }

        return $post;
    }
}
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