code: def is_following(user, obj, flag=''):
      
      check(obj)
  
      qs = apps.get_model('actstream', 'follow').objects.filter(
          user=user, object_id=obj.pk,
          content_type=ContentType.objects.get_for_model(obj)
      )
  
      if flag:
          qs = qs.filter(flag=flag)
  
      return qs.exists()
docs: Checks if a "follow" relationship exists.
  
      Returns True if exists, False otherwise.
  
      Pass a string value to ``flag`` to determine which type of "follow" relationship you want to check.
  
      Example::
  
          is_following(request.user, group)
          is_following(request.user, group, flag='liking')