public function findAllPosts()
 {
     $usersData = $this->storage->findAll();
     $result = [];
     foreach ($usersData as $data) {
         $user = new PostModel();
         $user->setId($data['id']);
         $user->setTitle($data['title']);
         $user->setContent($data['content']);
         $user->setAuthor($data['author']);
         $result[] = $user;
     }
     return $result;
 }