Sinatra + Bundler?

Question

I'm wondering how one can use Bundler with Sinatra. The idea is to use the gems that Bundler downloads inside the .gems folder.

Yehuda Katz has a great article about using bundler today: http://yehudakatz.com/2009/11/03/using-the-new-gem-bundler-today/ — Damien MATHIEU, Nov 10 '09 at 08:37
Also, the bundler documentation itself has a good example of how to setup a sinatra application http://gembundler.com/sinatra.html and it is current. — christophercotton, Nov 17 '10 at 03:51

Ryan McGeary · Answer 1 · 2011-03-27T04:18:58.953

48

Inside your Sinatra app, you just have to require the bundler setup:

require "bundler/setup"
require "sinatra"

get "/" do
  "Hello world!"
end

Alternatively, if you don't want to add the additional require "bundler/setup" at the top of your app, you can instead invoke sinatra via bundle exec (e.g. bundle exec ruby myapp.rb)

This assumes that you have a Gemfile in the root of your application. It might look like this:

source "http://rubygems.org"

gem "sinatra"

This also assumes that you've already installed bundler (gem install bundler) and that you ran bundle install to install all the gem dependencies.

edited Mar 27 '11 at 04:18

answered Nov 11 '09 at 02:42

Ryan McGeary

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3

if you use Bundler.require :defaults there's no need to manually require 'sinatra' or other gems – makevoid Mar 05 '14 at 23:56

score 11 · Accepted Answer · edited Sep 26 '14 at 18:30

11

I believe the best way is described here on EngineYard blog:

# This makes sure the bundled gems are in our $LOAD_PATH
require File.expand_path(File.join(File.dirname(__FILE__), 'vendor', 'gems', 'environment'))

# This actually requires the bundled gems
Bundler.require_env

class MyApp < Sinatra::Base
  # stuff
end

edited Sep 26 '14 at 18:30

Martin Tournoij

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answered Nov 13 '09 at 04:35

khelll

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makevoid · Answer 3 · 2017-06-06T13:23:09.790

As my original answer was quite old but there seems to be still attention to this topic here's the latest version of bundler/sinatra setup which will cover most of the use case:

A minimal config.ru

require './my_sinatra_app'
run MySinatraApp

An environment env.rb file that requires all the bundled gems (also supports loading the current environment's group):

require 'bundler/setup'

APP_ENV = ENV["RACK_ENV"] || "development"

Bundler.require :default, APP_ENV.to_sym

Then your app file (requiring the environment) with your sinatra app (Sinatra::Base):

require_relative 'env'

class MyApp < Sinatra::Base
  get "/" do
    "hello world"
  end
end

Start your development server with rackup, and Sinatra will be loaded via Bundler, your app will be accessible from http://localhost:9292.

$ rackup

or bundle exec rackup if needed

Make sure you have a Gemfile like the following one and you run the bundle command before starting the app

source "https://rubygems.org"

gem "sinatra"

gem "puma" # a better rack server than the default webrick

score 8 · Answer 4 · answered Dec 21 '10 at 09:20

+1 for the guide on the bundler website, but if you have a simple app and use Sinatra's dsl at the top level, then you need to do the following:

in your Gemfile (tell bundler not require sinatra):

gem 'sinatra', :require => false

and in the app's file (explicitly require sinatra):

require 'rubygems'
require 'bundler'
Bundler.require
require 'sinatra'

get '/' do
  'hello world'
end

score 0 · Answer 5 · answered Mar 21 '18 at 13:00

To use bundler with a Sinatra application, you only need to do two things. First, create a Gemfile.

gem 'sinatra'

Then, set up your config.ru file to load the bundle before it loads your Sinatra app.

require 'rubygems'
require 'bundler'

Bundler.require

require './my_sinatra_app'
run MySinatraApp

Start your development server with rackup, and Sinatra will be loaded via Bundler.

rackup

source bundler docs

Sinatra + Bundler?

5 Answers5