1 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations/has_many_through_association.rb b/activerecord/lib/active_record/associations/has_many_through_association.rb
index d258eac0ed..1f264d325a 100644
--- a/activerecord/lib/active_record/associations/has_many_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -203,6 +203,10 @@ module ActiveRecord
         def invertible_for?(record)
           false
         end
+
+        def append_record(record)
+          @target << record
+        end
     end
   end
 end