Rails have layout method that allows you to specify a layout for controller or some it actions. So we can specify a template (HTML) for each action.
But not only HTML specifies page’s design (view) but CSS and JS, also. Asset, in Rails terms.
But can specify an asset for each action (by standard Rails’ mechanism, without dancing-with-bells :))? If not, I think it’s a good idea to have it - to have a possibillity to change the whole page’s design.