Django: custom template template tags for loop

I'm trying to run a custom template tag, but I have some difficulties when I apply the tag in a for loop with multiple elements in a repeating thing.

I would like the tag to look below and only display the text “WORKED” if my permission function is True.

Pattern code

{% load permission_tags %}
{% for group in groups %}
<div>{% permission request.user can_edit_group on group %}WORKED{% endpermission %}</div>
{% endfor %}

The main tag uses a user instance, a permission string (that is, "can_edit_group"), the keyword "on" (only to make the syntax pleasant), and an object instance for checking permissions.

The permissions framework I'm going to here, I think, is working fine and is not really part of my question. The difficulty that I am facing is

"Caught AttributeError while rendering: 'User' object has no attribute 'resolve'" 
templatetags/permission_tags.py in render, line 23  (I've marked line 23 below)

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, templatetags/permission_tags.py

from django import template
register = template.Library()

def permission(parser, token):
    try:
        tag_name, username, permission, onkeyword, object = token.split_contents()
    except ValueError:
        raise template.TemplateSyntaxError("%r tag requires exactly 4 " 
                 "arguments" % token.contents.split()[0])
    nodelist = parser.parse(('endpermission',))
    parser.delete_first_token()
    return PermissionNode(nodelist, username, permission, object)


class PermissionNode(template.Node):
    def __init__(self, nodelist, user, permission, object):
        self.nodelist = nodelist
        self.user = template.Variable(user)
        self.permission = permission
        self.object = template.Variable(object)

    def render(self, context):

        self.user = self.user.resolve(context)   # <---- Line 23
        self.object = self.object.resolve(context)

        # My custom permissions code.  I don't think it's
        # causing the error I am experiencing
        permissions_obj = self.object.permissions(self.user)

        content = self.nodelist.render(context)

        # My custom permissions code.  I don't think it causing
        # the error.
        if hasattr(permissions_obj, self.permission):
            perm_func = getattr(permissions_obj, self.permission)
            if perm_func():
                return content 
        return ""

register.tag('permission', permission)

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