Simple Sinatra-based Ruby web application

application.rb

require "rubygems"
require "sinatra"
require "sequel"

@db = Sequel.connect(ENV["DATABASE_URL"]) # Provided by Heroku
@db.create_table? :names do
  primary_key :id
  String :name
end
@names = @db[:names]

get "/" do
  "Hello world!"
end

get "/:name" do |name|
  if @names.first(:name => name)
    "Naff off, #{name}!"
  else
    @names.insert(:name => name)
    "Hello, #{name}!"
  end
end

config.ru

# Standard "Rackup" file which tells Heroku how to load this Rack-based application
require "application"
run Sinatra::Application

Gemfile

source :rubygems
gem "sinatra"
gem "sequel"