Knp\Bundle\KnpBundlesBundle\Entity\Bundle::addActivity PHP Method

    public function addActivity(Activity $activity)
    {
        $this->activities[] = $activity;
    }

 /**
  * @param Bundle $bundle
  */
 public function setBundle(Bundle $bundle)
 {
     $this->bundle = $bundle;
     $this->bundleName = $bundle->getName();
     $this->bundleOwnerName = $bundle->getOwnerName();
     $bundle->addActivity($this);
 }