django admin view on site don't use get_absolute_url -

i'm using default django admin. registered models in admin.py,i define get_absolute_url in models, when i'm on editing form of model button view on site redirect me basic localhost:8000 no metter writing in get_absolute_url, appears admin didn't use @ all.

class products(models.model):   name=models.charfield(max_length=30,unique=true)   slug=models.charfield(max_length=30)   description=models.textfield(max_length=200)   price=models.floatfield()   created_at=models.datetimefield()   modified_at=models.datetimefield(blank=true,null=true)    def __unicode__(self):     return (self.name)    def get_absolute_url(self):     return '/foo/bar/' 

decision:

def get_absolute_url(self):     products.views import single_product     return reverse(single_product, args=[self.slug])