Initial ORM::delete_all() 'idea'

ORM.php

<?php

	public function delete_all()
	{
		$objects = $this->find_all()
			->as_array($this->_primary_key);
		
		if (method_exists($this, '_delete_row'))
		{
			foreach ($objects as $object)
			{
				$result = $this->_delete_row($object);
				
				// If ORM::delete_row() returns FALSE, row should not be deleted
				if ($result === FALSE)
				{
					unset($pks[$object->pk()]);
				}
			}
		}
		
		return DB::delete($this->_table_name)
			->where($this->_primary_key, 'IN', array_keys($objects))
			->execute($this->_db);
	}