2 files changed, 8 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
index aaf9e2e73f..8fc89de22b 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -153,6 +153,10 @@ module ActiveRecord
         "="
       end
 
+      def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
+        "WHERE #{quoted_primary_key} IN (SELECT #{quoted_primary_key} FROM #{quoted_table_name} #{where_sql})"
+      end
+
       protected
         # Returns an array of record hashes with the column names as keys and
         # column values as values.
diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index f1d13698c3..c2a0fb72bf 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -523,6 +523,10 @@ module ActiveRecord
         "= BINARY"
       end
 
+      def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
+        where_sql
+      end
+
       private
         def connect
           @connection.reconnect = true if @connection.respond_to?(:reconnect=)