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

The easiest way that I found is by adding all groups name to the context by using a context_preprocessor

In your app create a file context_processors.py and add the following content:

def user_groups_processor(request):
    groups = []
    user = request.user
    if user.is_authenticated:
        groups = list(user.groups.values_list('name',flat = True))
    return {'groups': groups}

in your settings, add the new context processor

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            # ... some options here ...
             "context_processors": [
                "my_app.context_processors.user_groups_processor"
            ],
        },
    },
]

Or if you prefer in settings.py

TEMPLATES[0]['OPTIONS']['context_processors'].append("my_app.context_processors.user_groups_processor")

After that in your templates you can use:

{% if 'vip' in groups %}
  
Paragraph only visible to VIPs
{% endif %}