get() returned more than one FormModelData

[dcale]

I keep getting this error if I submit a form more than once:

MultipleObjectsReturned at /form/test/done/
get() returned more than one FormModelData -- it returned 11!

The issue happens because of the following code:

       try:
            display_key = self.request.GET.get('display_key')
            data = FormModelData.objects.get(display_key=display_key)
            context.update({
                'data': data,
            })
        except FormModelData.DoesNotExist:
            pass

The issue is fixed if one uses FormModelData.objects.filter(display_key=display_key).all()[0]. But this feels more like a hotfix/hack, because the issue lies deeper, you expect that display_key is unique, which is not the case if the same guy submits twice.

The other fix would be to except all exception and simply pass...

[MarkusH]

I'm trying to figure out how you manage to get multiple keys (except for empty display keys, which should be NULL)