Rails with MongoDB recipe for our Amazon clusters.

database_cleaner.rb

require 'database_cleaner'
DatabaseCleaner.strategy = :truncation
DatabaseCleaner.orm = "mongoid"
Before { DatabaseCleaner.clean }

Gemfile

source 'http://rubygems.org'

gem 'rails', '3.0.3'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

gem 'mongoid', "2.0.0.rc.1"
gem 'bson_ext', "1.1.5"

gem 'devise'
gem 'haml'
gem 'flutie'
gem 'formtastic'
gem 'maruku'

gem 'carrierwave'
gem 'fog'

gem 'jquery-rails', '>= 0.2.6'

# Use unicorn as the web server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger (ruby-debug for Ruby 1.8.7+, ruby-debug19 for Ruby 1.9.2+)
# gem 'ruby-debug'
# gem 'ruby-debug19'

# Bundle the extra gems:
# gem 'bj'
# gem 'nokogiri'
# gem 'sqlite3-ruby', :require => 'sqlite3'
# gem 'aws-s3', :require => 'aws/s3'

# Bundle gems for the local environment. Make sure to
# put test-only gems in this group so their generators
# and rake tasks are available in development mode:
group :development, :test do
  gem 'ruby_parser'
  gem 'hpricot'
  gem 'capybara'
  gem 'database_cleaner'
  gem 'cucumber-rails'
  gem 'cucumber'
  gem 'rspec-rails', '>= 2.0.0.beta.10'
  gem 'spork'
  gem 'launchy'
end

gistfile3.sh

rails new $APP --skip-test --skip-active-record --skip-prototype
cd $APP

# Load up attached Gemfile

bundle install

# Mongoid
rails g mongoid:config
# Load up the attached mongoid.yml

# JQuery
rails g jquery:install

# Testing
rails g rspec:install

# HAML
git submodule add git://github.com/teeparham/rails3_haml_scaffold_generator.git lib/generators/haml

# Edit config/application.rb:
# config.generators do |g|
#   g.template_engine :haml
# end

touch config/database.yml
rails g cucumber:skeleton --rspec --capybara
rm config/database.yml

# Further edit config/application.rb:
# config.generators do |g|
#   g.template_engine :haml
#   g.test_framework :rspec
# end

# Fixup spec/spec_helper.rb for Mongoid using the attached version.
# Add features/support/database_cleaner.rb using the attached version.
# Comment this out in features/support/env.rb:
#
#   Cucumber::Rails::World.use_transactional_fixtures = true

# Forms
rake flutie:install
rails g formtastic:install

# Authentication
rails g devise:install
rails g devise User
rails g devise:views

# If you're going to push this to heroku, you want to say:
# heroku config:add BUNDLE_WITHOUT="development:test"

mongoid.yml

defaults: &defaults

development:
  host: localhost
  database: $APP_development

test:
  host: localhost
  database: $APP_test

# set these environment variables on your prod server
production:
  uri: <%= ENV['MONGOHQ_URL'] %>

spec_helper.rb

# This file is copied to spec/ when you run 'rails generate rspec:install'
ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails'

# Requires supporting ruby files with custom matchers and macros, etc,
# in spec/support/ and its subdirectories.
Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}

RSpec.configure do |config|

  require 'database_cleaner'

  # == Mock Framework
  #
  # If you prefer to use mocha, flexmock or RR, uncomment the appropriate line:
  #
  # config.mock_with :mocha
  # config.mock_with :flexmock
  # config.mock_with :rr
  config.mock_with :rspec

  # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
  # config.fixture_path = "#{::Rails.root}/spec/fixtures"

  # If you're not using ActiveRecord, or you'd prefer not to run each of your
  # examples within a transaction, remove the following line or assign false
  # instead of true.
  # config.use_transactional_fixtures = true

  config.before(:suite) do
    DatabaseCleaner.strategy = :truncation
    DatabaseCleaner.orm = "mongoid"
  end

  config.before(:each) do
    DatabaseCleaner.clean
  end

end