      def register_for_newsletter(request):
          # Check form values, etc., and subscribe the user.
          # ...
  
          current_site = Site.objects.get_current()
          send_mail('Thanks for subscribing to %s alerts' % current_site.name,
              'Thanks for your subscription. We appreciate it.\n\n-The %s team.' % current_site.name,
              'editor@%s' % current_site.domain,
              [user.email])
  
 
</s> remove     from django.contrib.sites.models import Site
 </s> add     from django.contrib.sites.models import get_current_site </s> remove The idiom of retrieving the :class:`~django.contrib.sites.models.Site` object
for the value of :setting:`settings.SITE_ID <SITE_ID>` is quite common, so
the :class:`~django.contrib.sites.models.Site` model's manager has a
``get_current()`` method. This example is equivalent to the previous one::
 </s> add This has also the advantage of checking if the sites framework is installed, and
return a :class:`RequestSite` instance if it is not.

If you don't have access to the request object, you can use the
``get_current()`` method of the :class:`~django.contrib.sites.models.Site`
model's manager. You should then ensure that your settings file does contain
the :setting:`SITE_ID` setting. This example is equivalent to the previous one:: </s> remove     def my_view(request):
 </s> add     def my_function_without_request(): </s> remove     from django.conf import settings
    from django.contrib.sites.models import Site
 </s> add     from django.contrib.sites.models import get_current_site </s> remove For code which relies on getting the current domain but cannot be certain
that the sites framework will be installed for any given project, there is a
utility function :func:`~django.contrib.sites.models.get_current_site` that
takes a request object as an argument and returns either a Site instance (if
the sites framework is installed) or a RequestSite instance (if it is not).
This allows loose coupling with the sites framework and provides a usable
fallback for cases where it is not installed.

.. function:: get_current_site(request)

    Checks if contrib.sites is installed and returns either the current
    :class:`~django.contrib.sites.models.Site` object or a
    :class:`~django.contrib.sites.models.RequestSite` object based on
    the request.

 </s> add 
        current_site = get_current_site(request)
      def register_for_newsletter(request):
          # Check form values, etc., and subscribe the user.
          # ...
  
        current_site = get_current_site(request)
          send_mail('Thanks for subscribing to %s alerts' % current_site.name,
              'Thanks for your subscription. We appreciate it.\n\n-The %s team.' % current_site.name,
              'editor@%s' % current_site.domain,
              [user.email])
  
keep keep keep keep replace keep keep keep keep keep
 Made more extensive use of get_current_site

Refs #15089 
docs/ref/contrib/sites.txt