Django - EstimateCountManager (faster, but innacurate counts for PostgreSQL)

managers.py

from django.db import connection
from django.db import models


class EstimateCountManager(models.Manager):
    def estimate_count(self):
        """
        Postgres really sucks at full table counts, this is a faster version
        see: http://wiki.postgresql.org/wiki/Slow_Counting
        """
        table_name = self.model._meta.db_table
        cursor = connection.cursor()
        cursor.execute("SELECT reltuples FROM pg_class WHERE relname='%s';" % table_name)
        row = cursor.fetchone()
        return int(row[0])