Railsのroutingで詳細ページのparamsをid以外に変える

通常 routes.rbでroutelingを記述すると

Rails.application.routes.draw do
  resources :posts
end

GET/posts(.:format)                                                                         posts#index
POST     /posts(.:format)                                                                         posts#create
GET        /posts/new(.:format)                                                                     posts#new
GET        /posts/:id/edit(.:format)                                                                posts#edit
GET        /posts/:id(.:format)                                                                     posts#show
PATCH    /posts/:id(.:format)                                                                     posts#update
PUT        /posts/:id(.:format)                                                                     posts#update
DELETE  /posts/:id(.:format)                                                                     posts#destroy