Unused Rails routes [ https://hackernoon.com/get-unused-routes-of-large-rails-app-0h1cu32lj ]

unused_routes.rb

require 'tabulo'
require 'rainbow'

Rails.application.eager_load!
unused_routes = {}

# Iterating over all non-empty routes from RouteSet
Rails.application.routes.routes.map(&:requirements).reject(&:empty?).each do |route|
  name = route[:controller].camelcase
  next if name.start_with?("Rails")

  controller = "#{name}Controller"

  if Object.const_defined?(controller) && !controller.constantize.new.respond_to?(route[:action])
    # Get route for which associated action is not present and add it in final results
    unless Dir.glob(Rails.root.join("app", "views", name.downcase, "#{route[:action]}.*")).any?
      unused_routes[controller] = [] if unused_routes[controller].nil?
      unused_routes[controller] << route[:action]
    end
  end
end

table = Tabulo::Table.new(unused_routes, border: :modern)
table.add_column(:first, header: 'Controller', styler: -> (cell_value, s) { cell_value ? Rainbow(s).purple : Rainbow(s).red })
table.add_column('Unused Actions', styler: -> (cell_value, s) { cell_value ? Rainbow(s).red : Rainbo(s).green }) { |k, v| v.join(' | ') }

puts table.pack