From f371d3f7094086ae183b3abc9cb3dc38ff361886 Mon Sep 17 00:00:00 2001
From: John Chilton <jmchilton@gmail.com>
Date: Thu, 3 May 2018 16:00:35 -0400
Subject: [PATCH] RuleBuilder - Fix paired identifier casting issue.

---
 client/galaxy/scripts/components/RuleCollectionBuilder.vue | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/client/galaxy/scripts/components/RuleCollectionBuilder.vue b/client/galaxy/scripts/components/RuleCollectionBuilder.vue
index 05e0b78588d..d5c8ace791f 100644
--- a/client/galaxy/scripts/components/RuleCollectionBuilder.vue
+++ b/client/galaxy/scripts/components/RuleCollectionBuilder.vue
@@ -1490,7 +1490,10 @@ export default {
                         identifierColumnIndex < numIdentifierColumns;
                         identifierColumnIndex++
                     ) {
-                        let identifier = rowData[identifierColumns[identifierColumnIndex]];
+                        // typeof indicates identifier is a string, but the raw string value coming from this data
+                        // structure sometimes does not work as expected with indexOf below, I don't understand why
+                        // but as a result this cast here seems needed.
+                        let identifier = String(rowData[identifierColumns[identifierColumnIndex]]);
                         if (identifierColumnIndex + 1 == numIdentifierColumns) {
                             // At correct final position in nested structure for this dataset.
                             if (collectionTypeAtDepth === "paired") {