migrate_to_kuma_wiki.py

    @transaction.commit_on_success(using='default')
    def make_breadcrumb_relationships(self, rows):
        """Set the topic_parent for Kuma pages using parent_id"""
        log.info("Building parent/child breadcrumb tree...")
        for r in rows:
            if not r['page_text'].strip():
                continue
            bc_ids = []
            bc_ids.insert(0, r['page_id'])
            if r['page_parent']:
                bc_ids = self._add_parent_ids(r, bc_ids)
            log.info("Migrating breadcrumb ids: %s" % bc_ids)
            self._migrate_necessary_mindtouch_pages(bc_ids)
            parent_doc = Document.objects.get(mindtouch_page_id=bc_ids.pop(0))
            for id in bc_ids:
                doc = Document.objects.get(mindtouch_page_id=id)
                doc.parent_topic = parent_doc
                doc.save()
                parent_doc = doc