def METHOD_NAME(cls):
    cls.builder = ChannelBuilder()
    cls.builder.insert_into_default_db()
    public.ContentNode.objects.all().update(available=True)
    cls.root = public.ContentNode.objects.get(id=cls.builder.root_node["id"])
    cls.node = cls.root.get_descendants().exclude(kind=content_kinds.TOPIC).first()
    cls.all_nodes = cls.node.get_ancestors(include_self=True)
    cls.files = public.File.objects.filter(contentnode__in=cls.all_nodes)
    cls.assessmentmetadata = public.AssessmentMetaData.objects.filter(
        contentnode__in=cls.all_nodes
    )
    cls.localfiles = public.LocalFile.objects.filter(
        files__in=cls.files
    ).distinct()
    cls.languages = public.Language.objects.filter(
        Q(id__in=cls.files.values_list("lang_id", flat=True))
        | Q(id__in=cls.all_nodes.values_list("lang_id", flat=True))
    )
    cls.through_tags = public.ContentNode.tags.through.objects.filter(
        contentnode__in=cls.all_nodes
    )
    cls.tags = public.ContentTag.objects.filter(
        id__in=cls.through_tags.values_list("contenttag_id", flat=True)
    ).distinct()