Unable to insert fetched feeds into database

[saadiashairyar]

After reading the instructions I can get the RSS feeds however I am not able to insert them into database.

This is the controller I have that fetches the feeds and then should insert into database

namespace AppBundle\Controller;

use AppBundle\Entity\Feed as Feed;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class DefaultController extends Controller
{
    /**
     * @Route("/", name="homepage")
     */
    public function indexAction()
    {
        // fetch the FeedReader
        $reader = $this->container->get('debril.reader');

        // this date is used to fetch only the latest items
        $unmodifiedSince = '11/11/2014';
        $date = new \DateTime($unmodifiedSince);

        // the feed you want to read
        $url = 'https://example.com/feed/';

        // now fetch its (fresh) content
        $feed = $reader->getFeedContent($url, $date);
        // in developer tool bar I can see the feeds using dump()
        dump($feed);

        $items = $feed->getItems();

        //Insert fetched feeds into database
        $feeds = new Feed;
        $reader->readFeed($url, $feeds, $date);
        return $this->render('default/index.html.twig');
    }

}

I do not see any error and I do not see any feeds inside my database table as well.

This is my Feed Entity

namespace AppBundle\Entity;

use Debril\RssAtomBundle\Protocol\FeedInterface;
use Debril\RssAtomBundle\Protocol\ItemIn;
use Doctrine\ORM\Mapping as ORM;

/**
 * Feed
 */
class Feed implements FeedInterface
{
    /**
     * @var integer
     */
    private $id;
    private $lastModified;
    private $title;
    private $description;
    private $link;
    private $publicId;

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Atom : feed.entry 
     * Rss  : rss.channel.item 
     * @param \Debril\RssAtomBundle\Protocol\ItemIn $item
     */
    public function addItem(ItemIn $item)
    {
        // TODO: Implement addItem() method.
    }

      public function setLastModified(\DateTime $lastModified)
    {
        $this->lastModified = $lastModified;

        return $this;
    }

    public function setTitle($title)
    {
        $this->title = $title;

        return $this;
    }

    public function setDescription($description)
    {
        $this->description = $description;

        return $this;
    }

    public function setLink($link)
    {
        $this->link = $link;

        return $this;
    }

    public function setPublicId($id)
    {
        $this->publicId = $id;

        return $this;
    }

    /**
     * Atom : feed.updated 
     * Rss  : rss.channel.lastBuildDate 
     * @return \DateTime
     */
    public function getLastModified()
    {
        return $this->lastModified;
    }

    /**
     * Atom : feed.title