title: Rails. Switch roles of a single user to buyer/seller like in fiverr
body: <p>I am developing a web application in rails that needs a single user to have two roles and he just switches between the two by a single click like that of Fiverr. I just want to know the best approaches and gems that do so. I have gone through 'rolify' and 'cancancan' but haven't figure out how to do so. Any help would be appreciated.</p>