Sinatra と Grape 同時に使う

app.rb

# -*- coding: utf-8 -*-

require 'grape'
require 'sinatra/base'

class App
  def self.application
    Rack::Cascade.new [Web, API]
  end

  class Web < Sinatra::Base
    get '/' do
      send_file File.join(settings.public_folder, 'index.html')
    end
  end

  class API < Grape::API
    prefix :api
  end
end

config.ru

# -*- coding: utf-8 -*-

require File.expand_path('app', File.dirname(__FILE__))

run App.application