Devise + Omniauth not working in production - devise

Question

I have devise already set up in my application. I want to add omniauth-facebook gem (for facebook authentication). The set up works fine in development and staging environments, but given me the following error in my production environment:
Could not load 'omniauth'. Please ensure you have the omniauth gem >= 1.0.0 installed and listed in your Gemfile.
/home/slaxman/apps/itextbook/shared/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- omniauth (LoadError)
This warning seems to originate from this devise file.
My Gemfile
source 'https://rubygems.org'
gem 'rails', '3.2.11'
group :production do
gem 'pg', '0.14.1'
gem 'therubyracer','0.11.4'
gem 'execjs', '1.4.0'
end
group :assets do
gem 'sass-rails', '~> 3.2.6'
gem 'jquery-rails', '~> 2.2.1'
gem 'coffee-rails', '~> 3.2.2'
gem 'uglifier', '~> 1.3.0'
gem 'bootstrap-sass', '~> 2.3.1.2'
gem 'bootswatch-rails', '~> 0.5.0'
end
gem 'unicorn', '~> 4.6.2'
gem 'capistrano', '~> 2.14.2'
gem "multi_json", "~> 1.2.0"
gem 'devise' , '~> 2.2.4'
gem 'omniauth-facebook', '1.4.0'
gem 'cancan', '~> 1.6.8'
gem 'omniauth', '>= 1.0.0'
user.rb
class User < ActiveRecord::Base
devise :database_authenticatable, :registerable, :omniauthable,
:recoverable, :rememberable, :trackable, :validatable
end
In devise.rb
config.omniauth :facebook, OMNIAUTH_VAR['FACEBOOK_APP_ID'], OMNIAUTH_VAR['FACEBOOK_APP_SECRET'], scope: 'email'
Adding the following to devise.rb also does not work
require 'omniauth-facebook'
require 'omniauth'
Any help will be greatly appreciated. Thanks!

Answer 1

Solved it! Apparently, it's a unicorn issue. Restarting unicorn doesn't help. It is necessary to stop and restart unicorn manually using the following commands:
/etc/init.d/unicorn_appname stop
/etc/init.d/unicorn_appname start
you can also do:
sudo service unicorn_appname stop
sudo service unicorn_appname start
replace 'appname' with the name of your app.
Answer Credit

Answer 2

It's probably not in the right order, here's an example of my Gemfile that works. Hope this helps.
source 'https://rubygems.org'
gem 'rails', '3.2.3'
gem 'pg'
gem 'jquery-rails'
gem 'devise'
gem 'omniauth-facebook'
gem 'acts_as_votable'
gem 'gibbon'
gem 'foreman'
gem 'ruby-sendhub'
gem 'bitly'
gem 'rack-rewrite'
gem 'twitter'
gem 'hpricot'
gem 'premailer-rails3'
gem 'kaminari'
group :assets do
gem 'sass-rails', '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
gem 'therubyracer', :platform => :ruby
gem 'uglifier', '>= 1.0.3'
end
group :test, :development do
gem "foreman"
gem "rspec-rails"
gem "factory_girl_rails"
gem "capybara"
gem "guard-rspec"
gem "spork"
gem "guard-spork"
gem "launchy"
gem "database_cleaner"
end