Hello, I''ve noticed that I can''t save my object to the DB after using ''unshift'' on one of Array fileds. Ex: (below ''tags'' is a collection in object ''transaction'') transaction.tags.unshift(Tag.find_or_create_by_name(name)) transaction.save! Everything is fine when I am using ''<<'' to append tag to array. Regards -- Posted via http://www.ruby-forum.com/.