resourcesとresourceを組み合わせる際の注意点 ref: http://qiita.com/items/9b792c9bcb8bc4289066

file1.txt

rake routes

file2.txt

                  users GET    /users(.:format)                        users#index
                   user GET    /users/:id(.:format)                    users#show
             edit_users GET    /users/edit(.:format)                   users#edit
                        PUT    /users(.:format)                        users#update

file3.txt

Failures:
1) UsersController routing /users routing /users CRUD routes to #edit
Failure/Error: get("/#{resources}/edit").should route_to("#{resources}#edit")
The recognized options <{"action"=>"show", "controller"=>"users", "id"=>"edit"}> did not match <{"controller"=>"users", "action"=>"edit"}>, difference: <{"action"=>"edit", "id"=>"edit"}>.
<{"controller"=>"users", "action"=>"edit"}> expected but was
<{"action"=>"show", "controller"=>"users", "id"=>"edit"}>.

file5.txt

rake routes

file6.txt

             edit_users GET    /users/edit(.:format)                   users#edit
                  users PUT    /users(.:format)                        users#update
                        GET    /users(.:format)                        users#index
                   user GET    /users/:id(.:format)                    users#show

routes.rb

resource :users, only: [:edit, :update]
resources :users, only: [:index, :show]