0
@@ -210,7 +210,8 @@ module ActiveRecord
0
 
0
         def raise_on_type_mismatch(record)
0
           unless record.is_a?(@reflection.klass)
0
-            raise ActiveRecord::AssociationTypeMismatch, "#{@reflection.klass} expected, got #{record.class}"
0
+            message = "#{@reflection.class_name}(##{@reflection.klass.object_id}) expected, got #{record.class}(##{record.class.object_id})"
0
+            raise ActiveRecord::AssociationTypeMismatch, message
0
           end
0
         end
0