Rails 3.1.rc5 on Heroku Cedar

application.rb

require File.expand_path('../boot', __FILE__)

require 'rails/all'

Bundler.require *Rails.groups(:assets) if defined?(Bundler)

module TestApp
  class Application < Rails::Application
  
    config.plugins = [ :exception_notification, :country_select, :all ] #:ssl_requirement, 
    config.encoding = "utf-8"

    config.filter_parameters += [:password, :password_confirmation]

    config.assets.enabled = true
    
    config.generators do |g|
      g.test_framework :rspec, :views => false, :fixture => true
      g.fixture_replacement :factory_girl, :dir => 'spec/factories'
    end
    
  end
end

Gemfile

source 'http://rubygems.org'

gem 'rails', '3.1.0.rc5'

group :assets do
  gem 'sass-rails', "~> 3.1.0.rc"
  gem 'coffee-rails', "~> 3.1.0.rc"
  gem 'uglifier'
  #gem 'sprockets', :git => 'git://github.com/sstephenson/sprockets.git'
end

gem 'jquery-rails'
gem 'devise' #, :git => 'https://github.com/plataformatec/devise.git'
gem 'devise_invitable'
gem "oa-oauth", :require => "omniauth/oauth"
gem 'inherited_resources'
gem 'resque', :require => "resque/server"
gem 'geocoder'
gem 'koala'
gem 'formtastic'
gem 'simple-navigation'
gem 'kaminari'
gem 'has_scope'
gem 'cancan'

group :test do
  gem 'turn', :require => false 
  gem "mocha"
  gem "launchy", "~> 2.0.4"
  gem 'factory_girl_rails'
  gem 'cucumber-rails'
  gem 'capybara'
  gem 'guard-cucumber'
  gem "guard-rspec"
  gem 'database_cleaner'
end

group :development do
	gem 'nifty-generators', :git => 'git://github.com/ryanb/nifty-generators.git'
end

group :production, :staging do
	gem 'pg'
  gem 'dalli'
  gem 'thin'
  #gem 'therubyracer-heroku', '0.8.1.pre3'
end

group :development, :test do
  gem 'sqlite3'
  gem 'ruby-debug19', :require => 'ruby-debug'
  gem "rspec-rails"
end

staging.rb

TestApp::Application.configure do    
  #site isn't live yet and is staging
  config.whiny_nils = true 
  config.consider_all_requests_local       = true
  
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.perform_deliveries = true
  config.action_mailer.default :charset => "utf-8"
  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.smtp_settings = {
    :address        => "smtp.sendgrid.net",
    :port           => "25",
    :authentication => :plain,
    :user_name      => ENV['SENDGRID_USERNAME'],
    :password       => ENV['SENDGRID_PASSWORD'],
    :domain         => ENV['SENDGRID_DOMAIN']
  }
  
  config.active_support.deprecation = :log

  # Only use best-standards-support built into browsers
  config.action_dispatch.best_standards_support = :builtin
  config.action_dispatch.x_sendfile_header = nil
  
  #Assets
  config.assets.compress = true
  config.assets.js_compressor  = :uglifier
  
  #Caching
  #config.cache_store = :dalli_store
  config.cache_classes = true
  #config.action_controller.perform_caching = true
  
end

uri = URI.parse(ENV["REDISTOGO_URL"])
Resque.redis = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)

To be clear my rack_env en rails_env are both set to staging on this particular Heroku app ;)
Only works if you have the path variables set correctly ;)

Just making sure you have seen http://devcenter.heroku.com/articles/rails31_heroku_cedar
Look at the bottom topic Updating PATH, does your path include bin?

It used to be that you had to add therubyracer-heroku gem in your production bundler group (which fixed exactly the same error for me on rails 3.1.0.rc4), but now you shouldn't have to include it. But as an experiment try to add therubyracer-heroku gem and bundle install.

@kmamykin Thx, I had seen the post. Just before you replied I realized I had /bin in my path instead of bin which resulted into it not working. After updating the path it works. Thanks for you time however ;)

I could get it to work with the ruby racer gem indeed but without it kept failing. Now I know why.

Rock on!