Reverse order of values when upserting

aidanharan · aidanharan · commit 445debab9b2e · 2025-03-23T09:40:41.000Z
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## Unreleased
+
+#### Fixed
+
+- [#1317](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/1317) Reverse order of values when upserting
+
 ## v8.0.5
 
 #### Added
diff --git a/lib/active_record/connection_adapters/sqlserver/database_statements.rb b/lib/active_record/connection_adapters/sqlserver/database_statements.rb
@@ -159,6 +159,8 @@ def build_insert_sql(insert) # :nodoc:
 
 
         def build_sql_for_merge_insert(insert:, insert_all:, columns_with_uniqueness_constraints:) # :nodoc:
+          insert_all.inserts.reverse! if insert.update_duplicates?
+
           sql = <<~SQL
             MERGE INTO #{insert.model.quoted_table_name} WITH (UPDLOCK, HOLDLOCK) AS target
             USING (
