How to start a Sinatra app using "run"

Question

I tried to use a Gemfile in my Sinatra app, but when I launched my app I got this error:

$ ruby config.ru  
config.ru:7:in `<main>': undefined method `run' for main:Object (NoMethodError)

Here are my three files:

hi.rb:

get "/" do
  "Hello world"
end

Gemfile:

gem "sinatra"

config.ru:

require 'rubygems'
require 'bundler'

Bundler.require

require File.join(File.dirname(__FILE__), 'hi.rb')
run Sinatra::Application

What did I do wrong? How can I fix this?

Answer 1

You should launch the application with:

rackup config.ru