mongoid-heroku.rb

file 'Gemfile', <<-GEMS
source 'http://gemcutter.org'
gem "rails",    "3.0.0.beta3"
gem "bson_ext"
gem "mongoid",  "2.0.0.beta4"
gem "haml",     "3.0.0.rc.2"
gem "compass",  "0.10.0.rc4"
gem "inherited_resources"

group :test do
  gem "rspec-rails", "2.0.0.beta.8"
  gem "capybara"
  gem 'database_cleaner'
  gem 'cucumber-rails', :git => 'git://github.com/aslakhellesoy/cucumber-rails.git'
  gem 'test-unit' #https://rspec.lighthouseapp.com/projects/16211/tickets/292
  gem 'machinist_mongo', :require => 'machinist/mongoid'
  gem 'faker'
end
GEMS

# Bundle 
run 'bundle install --relock'

# Initialize HAML and Compass
run 'bundle exec haml --rails .'
run 'bundle exec compass create . --using blueprint --app rails --sass-dir app/stylesheets --css-dir public/stylesheets'
run "sass-convert --from sass2 --to scss --recursive app/stylesheets"
run 'script/rails plugin install git://github.com/koppen/hassle.git' # for heroku

# Overwrites database.yml
file 'config/database.yml', <<-CODE
# Using MongoDB
CODE

file 'lib/tasks/mongo.rake', <<-RAKE
namespace :db do
  namespace :test do
    task :prepare do
      # Stub out for MongoDB
    end
  end
end
RAKE

# Initialize testing suite
run 'script/rails g rspec:install'
run 'script/rails g cucumber:skeleton --rspec --capybara'
run 'script/rails g mongoid:config'

file 'features/support/blueprints.rb', <<-EOF
require 'sham'
require 'faker'

EOF

file 'features/support/hooks.rb', <<-HOOK
Before { Sham.reset }
HOOK

file 'features/step_definitions/model_steps.rb', <<-RB
Given /^a (.+) with (.+) "([^\"]*)"$/ do |model,attribute,value|
  model.camelize.constantize.make attribute.dasherize => value
end
RB

# Remove default javascript files and initialize jQuery in application.js
run "rm public/javascripts/*.js"
run "curl -L http://github.com/rails/jquery-ujs/raw/master/src/rails.js > public/javascripts/rails.js"

# Add a haml layout with google's jQuery
file "app/views/layouts/application.haml", <<-HAML
!!! 5
%html
  %head
    = csrf_meta_tag
    
    = stylesheet_link_tag 'screen.css', :media => 'screen, projection'
    = stylesheet_link_tag 'print.css', :media => 'print'
    /[if lt IE 8]
      = stylesheet_link_tag 'ie.css', :media => 'screen, projection'
      
    = javascript_include_tag 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js'
    = javascript_include_tag 'application.js'
  %body
    = yield
HAML

file 'public/javascripts/application.js',
%q|jQuery(function () {
  
});
|

config = <<-CONFIG
    config.generators do |g|
      g.orm             :mongoid
      g.template_engine :haml
      g.test_framework  :rspec, :fixture => false
    end
CONFIG

inject_into_file 'config/application.rb', "#{config}", :after => "# end\n", :verbose => true

gsub_file 'features/support/env.rb', "require 'cucumber/rails/active_record'", "# require 'cucumber/rails/active_record'"
gsub_file 'features/support/env.rb', "Cucumber::Rails::World.use_transactional_fixtures = true", "# Cucumber::Rails::World.use_transactional_fixtures = true"
gsub_file 'config/application.rb', 'require "active_resource/railtie"', '# require "active_resource/railtie"'
gsub_file 'config/application.rb', 'require "rails/test_unit/railtie"', '# require "rails/test_unit/railtie"'
gsub_file 'config/application.rb', 'require "active_record/railtie"', '# require "active_record/railtie"'
gsub_file 'config/application.rb', 'Bundler.require(:default, Rails.env)', 'Bundler.require(Rails.env, :default)' # To be able to load machinist/mongoid before mongoid itself

# Remove index.html, application.html.erb and rails.png
run "rm public/index.html"
run "rm public/images/rails.png"
run "rm app/views/layouts/application.html.erb"

# Remove test directory since we're not using test/unit
run "rm -rf test"

readme = <<-README
===============================================================================

   Phew! All work done.

   * Your application is configured to use Mongoid, HAML/SASS,
   Compass with blueprint, rSpec, Cucumber, Capybara, Machinist and jQuery.
   SCSS, not SASS stylesheets are being used.
   
   * Gems are locked. After modifying your Gemfile, run bundle install --relock
   
   * Define machinist blueprints for cucumber in features/support/blueprints.rb

   * You can see all the included generators by 'rails generate'.

   * The MongoDB databases are prefixed by your application's name.

   * jQuery 1.4.2 (via google cdn) and its Rails helpers are in public/javascripts.

   * ActiveRecord is not being used. If you want to use it, uncomment the following
     line in application.rb:

     require "active_record/railtie"
     
     and these lines in features/support/env.rb:
     
     require 'cucumber/rails/active_record'
     Cucumber::Rails::World.use_transactional_fixtures = true
     

   Get coding!

===============================================================================
README

puts readme

What I was looking!

But I think that the rspec/test-unit bug is only for rspec 1.x (and it's marked as resolved on that link).

And you can do this on the config:

config.generators do |g|
  g.orm             :mongoid
  g.template_engine :haml
  g.test_framework  :rspec, :fixture_replacement => :machinist  # At least that's an option when you run 'rails g model --help'
end