From 0c767212e26015610fbb646892e0a9ebbb1cc762 Mon Sep 17 00:00:00 2001
From: Rufus Pollock <rufus.pollock@okfn.org>
Date: Fri, 29 Jun 2012 00:16:45 +0100
Subject: [PATCH] [#49,transform,bugfix][s]: be careful about selecting col for
 transform code as may have no fields as yet.

---
 src/view.transform.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/view.transform.js b/src/view.transform.js
index 3c8aa262..0b9a1a8a 100644
--- a/src/view.transform.js
+++ b/src/view.transform.js
@@ -44,7 +44,11 @@ my.Transform = Backbone.View.extend({
     // Put in the basic (identity) transform script
     // TODO: put this into the template?
     var editor = this.el.find('.expression-preview-code');
-    var col = this.model.fields.models[0].id;
+    if (this.model.fields.length > 0) {
+      var col = this.model.fields.models[0].id;
+    } else {
+      var col = 'unknown';
+    }
     editor.val("function(doc) {\n  doc['"+ col +"'] = doc['"+ col +"'];\n  return doc;\n}");
     editor.focus().get(0).setSelectionRange(18, 18);
     editor.keydown();