add mass order cancel adminaction

src/shop/admin.py

@@ -163,7 +163,7 @@ class OrderAdmin(admin.ModelAdmin):
 
     inlines = [ProductInline, ShopTicketInline]
 
-    actions = ['mark_order_as_paid', 'mark_order_as_refunded']
+    actions = ['mark_order_as_paid', 'mark_order_as_refunded', 'mark_order_as_cancelled']
 
     def mark_order_as_paid(self, request, queryset):
         for order in queryset.filter(paid=False):
@@ -175,6 +175,11 @@ class OrderAdmin(admin.ModelAdmin):
             order.mark_as_refunded(request)
     mark_order_as_refunded.description = 'Mark order(s) as refunded'
 
+    def mark_order_as_cancelled(self, request, queryset):
+        for order in queryset.filter(cancelled=False):
+            order.mark_as_cancelled(request)
+    mark_order_as_cancelled.description = 'Mark order(s) as cancelled'
+
 
 def get_user_email(obj):
     return obj.order.user.email

src/shop/models.py

@@ -227,6 +227,13 @@ class Order(CreatedUpdatedModel):
                 messages.success(request, "Order %s marked as refunded, no tickets to delete" % self.pk)
             self.save()
 
+    def mark_as_cancelled(self, request):
+        if self.paid:
+            messages.error(request, "Order %s is paid, cannot cancel a paid order!" % self.pk)
+        else:
+            self.cancelled = True
+            self.save()
+
     def is_not_handed_out(self):
         if self.orderproductrelation_set.filter(handed_out=True).count() == 0:
             return True