Improve vendor validation for new receiving batch

tailbone/views/purchasing/batch.py

@@ -405,6 +405,12 @@ class PurchasingBatchView(BatchMasterView):
                             'vendor_contact',
                             'status_code')
 
+    def valid_vendor_uuid(self, node, value):
+        model = self.model
+        vendor = self.Session.query(model.Vendor).get(value)
+        if not vendor:
+            raise colander.Invalid(node, "Invalid vendor selection")
+
     def render_store(self, batch, field):
         store = batch.store
         if not store: