python - How to make item in a cart not to display when it has order_number attached -

i have project working on, in project item(s) can added cart. when checked-out order created order_number tied item(s) in cart @ session. if more items added cart after when order have been created , cart viewed, shows items has order_number attached , and new items added.

how make items have order_number attached not display in cart since order_number has been attached when checked-out.

here views.py

@login_required() def cart(request):     request_user = request.user      items = cart.objects.filter(client=request_user)      if request.method == "post":         print "rp ", request.post         docfile = request.post['docfile']         print "docfile", docfile         description = request.post['description']         print "description ", description         price = request.post['price']         print "price ", price         quantity = request.post['quantity']         print "quantity ", quantity         client = request.user         print "client ", client          item, created = cart.objects.get_or_create(client=client, description=description, price=price, quantity=quantity)         item.save()      return render(request, 'selly/cart.html', {'items': items})   @login_required def order(request):     order_number = create_id()     print "order number", order_number     request_user = request.user     all_items = cart.objects.filter(client=request_user, ordered=false)     print "all item", all_items     if request.method == "post":         client = request.user         # print "client ", client         location=request.user.signup.country         # print "location ", location          item, created = order.objects.get_or_create(order_number=order_number, client=client, location=location)         item.save()      order = order.objects.filter(order_number = order_number)     print "order", order     all_items.update(ordered = true, order = order[0])     my_order = order.objects.filter(client=request_user) #populate client's order template     return render(request, "selly/order.html", {'my_order': my_order, 'order': order}) 

here models.py

class cart(models.model):     client = models.foreignkey(user, null=true)     description = models.charfield(max_length = 100)     price = models.decimalfield(max_digits=10, decimal_places=2)     quantity = models.positiveintegerfield()     ordered = models.booleanfield(default=false)     order = models.foreignkey('order', blank=true, null=true)     created_on = models.datetimefield(auto_now_add = true)      def __str__(self):         return self.description      def total(self):         return self.price * self.quantity   class order(models.model):     client = models.foreignkey(user, null=true)     order_number = models.charfield(max_length = 12)     location = models.charfield(max_length=12)     payment_status = models.charfield(max_length=20, choices = payment_status, default='pending')     shipment_status = models.charfield(max_length=20, choices = shipment_status, default='pending')     created_on = models.datetimefield(auto_now_add = true)      def __str__(self):         return self.order_number