caustic config/routes.rb

def omgwtf_resources(controller, single, plural)
  scope "/#{single}", controller: controller do
    match ''         => :index,  as: plural,           via: :get
    match 'new'      => :new,    as: "new_#{single}",  via: :get
    match 'new'      => :create, as: '',               via: :post
    match ':id'      => :show,   as: "#{single}",      via: :get
    match ':id/edit' => :edit,   as: "edit_#{single}", via: :get
    match ':id'      => :update, as: '',               via: [:put, :patch]
    match ':id'      => :delete, as: '',               via: :delete
  end
end

Rails.application.routes.draw do
  root to: 'common#index'

  controller :sessions do
    get   '/login'  => :new,     as: 'login'
    post  '/login'  => :create
    match '/logout' => :destroy, as: 'logout', via: :all
  end

  ## resources :users
  omgwtf_resources :users, 'user', 'users'

  ## resources :domains
  omgwtf_resources :domains, 'domain', 'domains'
end