unindent does not match any outer indentation level

 
am getting unindentation error can any one fix my problem


File "/home/deepak/Desktop/ecommerce-2/src/products/models.py", line 31
    def get_absolute_url(self):





from django.core.urlresolvers import reverse
from django.db import models
class ProductQuerySet(models.query.QuerySet):
      def active(self):
            return self.filter(active=True)
class ProductManager(models.Manager):
            def get_queryset(self):
                  return ProductQuerySet(self.model,using=self._db)
            def all(self,*args,**kwargs):
                     return self.get_queryset().active()


class Product(models.Model):
            title = models.CharField(max_length=120)
            description = models.TextField(blank=True, null=True)
            price = models.DecimalField(decimal_places=2, max_digits=20)
            active = models.BooleanField(default=True)

            objects = ProductManager()
    def get_absolute_url(self):
                         return reverse("product_detail", kwargs={"pk":self.pk})

            def __unicode__(self):
                        return self.title

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