Remove associated records from identity map if any raised an unexpected exception.

activerecord/lib/active_record/autosave_association.rb

@@ -320,6 +320,7 @@ module ActiveRecord
         autosave = reflection.options[:autosave]
 
         if records = associated_records_to_validate_or_save(association, @new_record_before_save, autosave)
+          begin
             records.each do |record|
               next if record.destroyed?
 
@@ -337,6 +338,10 @@ module ActiveRecord
 
               raise ActiveRecord::Rollback if saved == false
             end
+          rescue
+            records.each {|x| IdentityMap.remove(x) } if IdentityMap.enabled?
+            raise
+          end
         end
 
         # reconstruct the scope now that we know the owner's id