python - Django variable in base.html

Question

base.html is used as the base template for all other pages. base.html has the navigation bar and in the navigation bar, I want to show the number of messages the user received. Thus, I need to have a variable like {{number_of_messages}} in the base.html.

However, how should I pass this variable to it? Every template extends base.html and is rendered by a function. I don't think returning number_of_messages in all functions is a good way. Is there better way to implement this? How can I pass this variable to all templates?

Answer 1

You can use tags.

#myproject/myproject/templatetags/tags.py

from django import template

register = template.Library()

@register.simple_tag
def number_of_messages(request):
    return _number

In your Base.html

{% load tags %}
    {% number_of_messages request %}