How to check (in template) if user belongs to a group

Question

How to check in template whether user belongs to some group?

It is possible in a view which is generating the template but what if I want

Answer 1

In your app create a folder 'templatetags'. In this folder create two files:

__init__.py

auth_extras.py

from django import template
from django.contrib.auth.models import Group 

register = template.Library()

@register.filter(name='has_group')
def has_group(user, group_name): 
    group = Group.objects.get(name=group_name) 
    return True if group in user.groups.all() else False

It should look like this now:

app/
    __init__.py
    models.py
    templatetags/
        __init__.py
        auth_extras.py
    views.py

After adding the templatetags module, you will need to restart your server before you can use the tags or filters in templates.

In your base.html (template) use the following:

{% load auth_extras %}

and to check if the user is in group "moderator":

{% if request.user|has_group:"moderator" %} 
    
moderator
 
{% endif %}

Documentation: https://docs.djangoproject.com/en/1.11/howto/custom-template-tags/