From 57295f24b1bef60204c822b19a7c0ac1967ec412 Mon Sep 17 00:00:00 2001
From: Jayanthi <88632084+soujay@users.noreply.github.com>
Date: Mon, 26 Dec 2022 05:57:44 -0800
Subject: [PATCH] Improve exception info when users share types between sagas
 (#703) (#930)

Co-authored-by: Ramon Smits <ramon.smits@gmail.com>
---
 .../SagaPersisters/SagaModelMapper.cs                  | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/NServiceBus.NHibernate/SagaPersisters/SagaModelMapper.cs b/src/NServiceBus.NHibernate/SagaPersisters/SagaModelMapper.cs
index 1f354a350..038d216aa 100644
--- a/src/NServiceBus.NHibernate/SagaPersisters/SagaModelMapper.cs
+++ b/src/NServiceBus.NHibernate/SagaPersisters/SagaModelMapper.cs
@@ -67,7 +67,15 @@ public static List<string> AddMappings(Configuration configuration, SagaMetadata
                     idx.AddColumns(foreignKey.ColumnIterator);
                     idx.Name = "IDX" + foreignKey.Name.Substring(2);
                     idx.Table = table;
-                    table.AddIndex(idx);
+
+                    try
+                    {
+                        table.AddIndex(idx);
+                    }
+                    catch (MappingException e)
+                    {
+                        throw new Exception("Failed to add index! Are your sagas sharing types?", e);
+                    }
                 }
             }