`draw` method to explore routes in the console

routes.rb

# All these requires are just for running via `irb`, if using `bin/rails console` you probably just need the method.
require "active_support/all" # Got an inflector NoMethodError, so I'm just being lazy here.

require "action_dispatch"
require "action_dispatch/routing/route_set"
require "action_dispatch/routing/inspector"

require "action_controller" # For the ActionController::Parameters autoload, which any route helper uses.

# Console helper play around with the routing DSL and tweak an individual route you're building.
#
#   draw { resources :posts } => routes
#   routes.url_helpers.photos_url(host: "example.com") # => example.com/photos
#
# Basically what `bin/rails routes` does:
# https://github.com/rails/rails/blob/58e7fc18cbe3fce68ce86566b808ce98c3009477/railties/lib/rails/commands/routes/routes_command.rb#L25
def draw(&block)
  ActionDispatch::Routing::RouteSet.new.tap do |route_set|
    route_set.draw(&block)

    formatter = ActionDispatch::Routing::ConsoleFormatter::Sheet.new
    pp ActionDispatch::Routing::RoutesInspector.new(route_set.routes).format(formatter)
  end
end