public function load(ObjectManager $manager)
 {
     for ($i = 0; $i < 40; $i++) {
         $product = new Product();
         $product->setName('Name Product ' . $i);
         $featureA = new Feature();
         $featureA->setName('Description');
         $featureA->setDescription("This is a feature's description");
         $featureA->setProduct($product);
         $manager->persist($featureA);
         $product->addFeature($featureA);
         $featureB = new Feature();
         $featureB->setName('Warranty');
         $featureB->setDescription("This is a warranty's description");
         $featureB->setProduct($product);
         $manager->persist($featureB);
         $product->addFeature($featureB);
         $manager->persist($product);
     }
     $manager->flush();
 }