User group template tag with "else" block support

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
from django import template
from django.template import resolve_variable, NodeList
from django.contrib.auth.models import Group

register = template.Library()

@register.tag()
def ifusergroup(parser, token):
    """ Check to see if the currently logged in user belongs to a specific
    group. Requires the Django authentication contrib app and middleware.

    Usage: {% ifusergroup Admins %} ... {% endifusergroup %}, or
           {% ifusergroup Admins %} ... {% else %} ... {% endifusergroup %}

    """
    try:
        tag, group = token.split_contents()
    except ValueError:
        raise template.TemplateSyntaxError("Tag 'ifusergroup' requires 1 argument.")
    
    nodelist_true = parser.parse(('else', 'endifusergroup'))
    token = parser.next_token()
    
    if token.contents == 'else':
        nodelist_false = parser.parse(('endifusergroup',))
        parser.delete_first_token()
    else:
        nodelist_false = NodeList()
    
    return GroupCheckNode(group, nodelist_true, nodelist_false)


class GroupCheckNode(template.Node):
    def __init__(self, group, nodelist_true, nodelist_false):
        self.group = group
        self.nodelist_true = nodelist_true
        self.nodelist_false = nodelist_false
    def render(self, context):
        user = resolve_variable('user', context)
        
        if not user.is_authenticated():
            return self.nodelist_false.render(context)
            
        try:
            group = Group.objects.get(name=self.group)
        except Group.DoesNotExist:
            return self.nodelist_false.render(context)
            
        if group in user.groups.all():
            return self.nodelist_true.render(context)
        else:
            return self.nodelist_false.render(context)

More like this

  1. User groups template tag with "else" block support (Allow checking several groups) by br0th3r 1 year, 12 months ago
  2. User groups template tag by hijinks 4 years, 10 months ago
  3. Template tag "ifregex" and "ifnotregex" by arthurfurlan 4 years, 11 months ago
  4. {% if %} tag with {% elif %} support by amagee 3 years, 6 months ago
  5. User group template tag by jdriscoll 6 years, 10 months ago

Comments

(Forgotten your password?)