I've read the B-Simple REST tutorial (http://www.b-simple.de/documents)
which explains this process for one-to-many associations. But things are
a little different for me, because I only want one avatar per user, I do
not need an index action and the urls do look different. For example, I
want /user/:user_id/avatar to show the user avatar,
/user/:user_id/avatar;edit to change the avatar etc.
map.resources :people do |people|
people.resource :avatar
end
avatar_url(:person_id => person) # => /people/5/avatar
edit_avatar_url(:person_id => person) # => /people/5/avatar;edit
