/**
  * Delete all instances of a block across styles/routes
  */
 public function delete_blocks_by_name($block_name)
 {
     $collection = $this->block_mapper->find(array('name' => $block_name));
     foreach ($collection as $entity) {
         $this->block_mapper->delete($entity);
     }
 }
 protected function _delete_blocks($blocks_to_delete)
 {
     if (sizeof($blocks_to_delete)) {
         $this->block_mapper->delete(array('bid' => array_keys($blocks_to_delete)));
     }
 }