1 files changed, 4 insertions, 5 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 1f264d325a..0c0aefe3b9 100644
--- a/activerecord/lib/active_record/associations/has_many_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -86,7 +86,10 @@ module ActiveRecord
         end
 
         def save_through_record(record)
-          build_through_record(record).save!
+          association = build_through_record(record)
+          if association.changed?
+            association.save!
+          end
         ensure
           @through_records.delete(record.object_id)
         end
@@ -203,10 +206,6 @@ module ActiveRecord
         def invertible_for?(record)
           false
         end
-
-        def append_record(record)
-          @target << record
-        end
     end
   end
 end