'The store is updated with newly collected transformers data from
the modulestore.'

def _update_collected(self):

    with self._bulk_operations():
        block_structure = BlockStructureFactory.create_from_modulestore(self.root_block_usage_key, self.modulestore)
        BlockStructureTransformers.collect(block_structure)
        self.store.add(block_structure)
        return block_structure
