How can we achieve this in Rails !

I’m a few weeks away from finishing a rails 2 rewrite of an bookmark app I made a few years ago called HomeMarks. I’d say I’m in the middle of nested drag and drop hell now. If you care to take a look at some of the solutions I have, please check out the project page on Github http://github.com/metaskills/homemarks/tree/master

One thing I ended up creating was a SortuableUtils JavaScript module that I use to serialize and dynamically add/remove sortables/draggables/droppables. The serialization is the nicest. The default way Scriptaculous is to send a sorted aray of IDs which can make for nasty controller actions. Currently I have the sortable objects not only find what was added, but at what position and even what scope (ie… chaning boxes, etc.).

It handles the apply-to-new-elements bit that you were struggling with manually.