DELETE an existing repositories group permission users group

        :param group_name:

        """

        try:

            recursive = str2bool(request.POST.get('recursive', False))

            ReposGroupModel().delete_permission(

                repos_group=group_name, obj=request.POST['users_group_id'],

                obj_type='users_group', recursive=recursive

            )

            Session().commit()

        except Exception:

            log.error(traceback.format_exc())

            h.flash(_('An error occurred during deletion of group'

                      ' users groups'),

                    category='error')

            raise HTTPInternalServerError()

    def show_by_name(self, group_name):

        """

        This is a proxy that does a lookup group_name -> id, and shows

        the group by id view instead

        """

        group_name = group_name.rstrip('/')

        id_ = RepoGroup.get_by_group_name(group_name)

        if id_:

            return self.show(id_.group_id)

        raise HTTPNotFound

    @HasReposGroupPermissionAnyDecorator('group.read', 'group.write',

                                         'group.admin')

    def show(self, id, format='html'):

        """GET /repos_groups/id: Show a specific item"""

        # url('repos_group', id=ID)

        c.group = RepoGroup.get_or_404(id)

        c.group_repos = c.group.repositories.all()

        #overwrite our cached list with current filter

        gr_filter = c.group_repos

        c.cached_repo_list = self.scm_model.get_repos(all_repos=gr_filter)

        c.repos_list = c.cached_repo_list

        c.repo_cnt = 0

            .filter(RepoGroup.group_parent_id == id).all()

        return render('admin/repos_groups/repos_groups.html')

    @HasPermissionAnyDecorator('hg.admin')

    def edit(self, id, format='html'):

        """GET /repos_groups/id/edit: Form to edit an existing item"""

        # url('edit_repos_group', id=ID)

        c.repos_group = ReposGroupModel()._get_repos_group(id)

        defaults = self.__load_data(c.repos_group.group_id)

        # we need to exclude this group from the group list for editing

        c.repo_groups = filter(lambda x: x[0] != c.repos_group.group_id,

                               c.repo_groups)

        return htmlfill.render(

            render('admin/repos_groups/repos_groups_edit.html'),

            defaults=defaults,

            encoding="UTF-8",

            force_defaults=False

        )