'Get each item, convert it to draft, and shift to a new course export dir.'

def convert_to_draft(self, block_list):

    for (block_type, block_id) in block_list:
        with self.store.branch_setting(ModuleStoreEnum.Branch.published_only):
            test_item = self.store.get_item(self.course.id.make_usage_key(block_type=block_type, block_id=block_id))
        self.store.convert_to_draft(test_item.location, self.user_id)
    self.export_dir = self._make_new_export_dir_name()
