Add common logic to validate employee reference field

tailbone/views/master.py

@@ -856,6 +856,13 @@ class MasterView(View):
             url = self.request.route_url('stores.view', uuid=store.uuid)
             return tags.link_to(text, url)
 
+    def valid_employee_uuid(self, node, value):
+        if value:
+            model = self.model
+            employee = self.Session.get(model.Employee, value)
+            if not employee:
+                node.raise_invalid("Employee not found")
+
     def render_product(self, obj, field):
         product = getattr(obj, field)
         if not product: