From 4757a56002b2fe9e6f4120e3434f3a14fd04c665 Mon Sep 17 00:00:00 2001
From: Lance Edgar <ledgar@sacfoodcoop.com>
Date: Sun, 16 Oct 2016 03:32:00 -0500
Subject: [PATCH] Fix bug in batch ID field renderer, when displayed for new
 batch

Hopefully this is a good idea..
---
 tailbone/forms/renderers/batch.py | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tailbone/forms/renderers/batch.py b/tailbone/forms/renderers/batch.py
index 0c7034e0..76a6d5ca 100644
--- a/tailbone/forms/renderers/batch.py
+++ b/tailbone/forms/renderers/batch.py
@@ -40,9 +40,15 @@ class BatchIDFieldRenderer(fa.FieldRenderer):
     Renderer for batch ID fields.
     """
     def render_readonly(self, **kwargs):
-        batch_id = self.raw_value
-        if batch_id:
-            return '{:08d}'.format(batch_id)
+        try:
+            batch_id = self.raw_value
+        except AttributeError:
+            # this can happen when creating a new batch, b/c the default value
+            # comes from a sequence
+            pass
+        else:
+            if batch_id:
+                return '{:08d}'.format(batch_id)
         return ''