add delete_lost_cartitems command

tinycart/management/commands/delete_lost_cartitems.py

@@ -0,0 +1,25 @@
+import sys
+
+from django.core.management.base import BaseCommand
+
+from tinycart.models import CartItem
+
+
+def delete_objects(verbosity=1):
+    stdout = sys.stdout
+    count_lost_items = 0
+    for item in CartItem.objects.all():
+        if item.product is None:
+            item.delete()
+            count_lost_items += 1
+    if verbosity > 0:
+        stdout.write('Delete %d cart items\n' % count_lost_items)
+
+
+class Command(BaseCommand):
+
+    help = 'Remove lost (deleted) products from cart items.'
+
+    def handle(self, *args, **options):
+        self.verbosity = int(options.get('verbosity', 1))
+        delete_objects(verbosity=self.verbosity)