Example refactored routes

refactored_routes.rb

def post_link_relation(resource, constraint)
  post "/links/:link_relation",
       to: "#{resource}#update_links",
       constraints: { link_relation: constraint },
       format: false
end

def delete_link_relation(resource, constraint)
  delete "/links/:link_relation/:link_ids",
         to: "#{resource}#destroy_links",
         constraints: { link_relation: constraint },
         format: false
end

def default_except
  [:new, :edit]
end

def resources_to_route
  [
    [ :users, /user_groups/, [:new, :edit, :create] ],
    [ :groups, /users/, default_except ],
    [ :projects, /(subject_sets|workflows)/, default_except ],
    [ :workflows, /subject_sets/, default_except ],
    [ :subject_sets, /(workflows|subjects)/, default_except ],
    [ :collections, /subjects/, default_except ],
    [ :subject_queues, /set_member_subjects/, default_except ]
  ]
end

Rails.application.routes.draw do

  use_doorkeeper do
    controllers authorizations: 'authorizations',
      tokens: 'tokens'
  end

  devise_for :users, controllers: { omniauth_callbacks: 'omniauth_callbacks', passwords: 'passwords' }, skip: [ :sessions, :registrations ]

  as :user do
    get "/users/sign_in" => "sessions#new", as: :new_user_session
    post "/users/sign_in" => "sessions#create", as: :user_session
    delete "/users/sign_out" => "sessions#destroy", as: :destroy_user_session

    get "/users/sign_up" => "registrations#new", as: :new_user_registration
    post "/users" => "registrations#create", as: :user_registration
  end

  namespace :api do
    api_version(:module => "V1", :header => {name: "Accept", :value => "application/vnd.api+json; version=1"}) do

      get "/me", to: 'users#me', format: false

      resources :classifications, except: default_except, format: false
      resources :memberships, except: default_except, format: false
      resources :subjects, except: default_except, format: false

      resources_to_route.each do |route_params|
        resource, constraint, except = route_params
        resources resource, except: except, format: false do
          link_params = [ resource, constraint ]
          post_link_relation(*link_params)
          delete_link_relation(*link_params)
        end
      end
    end
  end

  root to: "home#index"
  match "*path", to: "application#unknown_route", via: :all
end