djredis_iface.py

from djredis.models import DredisMixin
import djredis.fields

class Blog(models.Model, DredisMixin): # inherit from the mixin class
    author = models.ForeignKey('Author')
    title = models.CharField(max_length=200)
    viewcount = djredis.fields.Counter()

    # optionally add a unique keyspace for the instance - default is shown below
    def redis_key(self):
        return '%s:%s:%s' % (self._meta.app_label, self._meta.module_name, self.pk)

blog = Blog.objects.get(pk=1)
blog.viewcount.incr()
# or equivalently:
blog.viewcount += 1