return updates

    def update(self, repo_group, repo_group_args):

        try:

            repo_group = db.RepoGroup.guess_instance(repo_group)

            old_path = repo_group.full_path

            # change properties

            if 'group_description' in repo_group_args:

                repo_group.group_description = repo_group_args['group_description']

            if 'parent_group_id' in repo_group_args:

                assert repo_group_args['parent_group_id'] != '-1', repo_group_args  # RepoGroupForm should have converted to None

                repo_group.parent_group = db.RepoGroup.get(repo_group_args['parent_group_id'])

            if 'group_name' in repo_group_args:

                group_name = repo_group_args['group_name']

                if kallithea.lib.utils2.repo_name_slug(group_name) != group_name:

                    raise Exception('invalid repo group name %s' % group_name)

                repo_group.group_name = repo_group.get_new_name(group_name)

            new_path = repo_group.full_path

            meta.Session().add(repo_group)

            # iterate over all members of this groups and do fixes

            # if obj is a repoGroup also fix the name of the group according