In_place_editor_field for select tag

I need to have a in_place_edit_field for select tag.
I've been looking in /public/javascripts/console.js source and found Ajax.InPlaceCollectionEditor JS class which seems to be the right one I need.
But the problem is that I use ajax in rails first time and I don't know how to use it in my rails application. I can't find anything in rails API, either. I've only found in_place_editor_field which I successfully use.

Thanks in advance for any suggestions.