Returns an html string node useful for providing a visual cue to the permission group required; django-guradian required.

obj_groups.py

from django import template, template
from django.contrib.auth.models import Group
from guardian.shortcuts import get_groups_with_perms
register = template.Library()

class ObjectGroups(template.Node):
    """
    Returns an html string node useful for providing a visual cue to the 
    permission group required.  
    
    Example of usage (assuming ``flatpage`` is available from *context*)::

    <h1>{% obj_groups flatpage %}{{flatpage.title}}</h1>
    
        would result in:
    
    <h1><span class='clsPaid clsRegister [cls...]'>&nbsp;</span>{{flatpage.title}}</h1>
    
    """
    def __init__(self, obj):
        self.obj = obj # resolved in render method as needed

    def render(self, context):
        ### check against an instance or a model class 
        instance = template.Variable(self.obj).resolve(context)
        instance_groups = get_groups_with_perms(instance)
        html = '<span title="Access Level: %s" class="%s">&nbsp;</span>'
        titles = ''
        classes = ''
        for group in instance_groups:
            titles = titles + '%s ' % group.name
            classes = classes + 'cls%s ' % group.name
        html = html % (titles, classes)
        return html

@register.tag # this is just synonym with register.tag('get_obj_groups', get_obj_groups)
def obj_groups(parser, args):
    tag_template_syntax = "Tag's syntax is {%% %s <obj_instance> %%}"
    try:
        # split_contents() knows not to split quoted strings.
        tag_name, obj = args.split_contents()
    except ValueError:
        raise template.TemplateSyntaxError(tag_template_syntax % args.contents.split()[0])

    return ObjectGroups(obj)