optimize unique check
optimize unique check

khchine5/django-shop,divio/django-shop,awesto/django-shop,nimbis/django-shop,divio/django-shop,rfleschenberg/django-shop,jrief/django-shop,nimbis/django-shop,rfleschenberg/django-shop,rfleschenberg/django-shop,khchine5/django-shop,divio/django-shop,jrief/django-shop,awesto/django-shop,rfleschenberg/django-shop,nimbis/django-shop,khchine5/django-shop,khchine5/django-shop,nimbis/django-shop,jrief/django-shop,jrief/django-shop,awesto/django-shop