Add badge to nav for number of waiting invoices

Might slightly help us stop leaving them waiting for far too long...

RIGS/finance.py

@@ -179,24 +179,7 @@ class InvoiceWaiting(generic.ListView):
         return context
 
     def get_queryset(self):
-        return self.get_objects()
-
-    def get_objects(self):
-        # TODO find a way to select items
-        events = self.model.objects.filter(
-            (
-                Q(start_date__lte=datetime.date.today(), end_date__isnull=True) |  # Starts before with no end
-                Q(end_date__lte=datetime.date.today())  # Has end date, finishes before
-            ) & Q(invoice__isnull=True) &  # Has not already been invoiced
-            Q(is_rig=True)  # Is a rig (not non-rig)
-
-        ).order_by('start_date') \
-            .select_related('person',
-                            'organisation',
-                            'venue', 'mic') \
-            .prefetch_related('items')
-
-        return events
+        return self.model.objects.waiting_invoices()
 
 
 class InvoiceEvent(generic.View):