Sort mobile receiving rows by last modified instead of sequence

because we now prefer to aggregate rows for that, at least by default

tailbone/views/purchasing/receiving.py

@@ -571,15 +571,22 @@ class ReceivingBatchView(PurchasingBatchView):
 
     def get_mobile_row_data(self, parent):
         query = self.get_row_data(parent)
-        aggregate_products = not bool(parent.truck_dump) # TODO: make this configurable?
-        if not aggregate_products:
-            query = query.order_by(model.PurchaseBatchRow.sequence.desc())
-        return query
+        return self.sort_mobile_row_data(query)
+
+    def sort_mobile_row_data(self, query):
+        return query.order_by(model.PurchaseBatchRow.modified.desc())
 
     def render_mobile_row_listitem(self, row, i):
         description = row.product.full_description if row.product else row.description
         return "({}) {}".format(row.upc.pretty(), description)
 
+    def should_aggregate_products(self, batch):
+        """
+        Must return a boolean indicating whether rows should be aggregated by
+        product for the given batch.
+        """
+        return True
+
     # TODO: this view can create new rows, with only a GET query.  that should
     # probably be changed to require POST; for now we just require the "create
     # batch row" perm and call it good..
@@ -606,8 +613,7 @@ class ReceivingBatchView(PurchasingBatchView):
                            .all()
 
         if rows:
-            aggregate_products = not bool(batch.truck_dump) # TODO: make this configurable?
-            if aggregate_products:
+            if self.should_aggregate_products(batch):
                 if len(rows) > 1:
                     log.warning("found multiple UPC matches for {} in batch {}: {}".format(
                         upc, batch.id_str, batch))