#415 Upgrading to Rails 4

May 06, 2013 | 12 minutes | Rails 4.0

With the release of Rails 4.0.0.rc1 it's time to try it out and report any bugs. Here I walk you through the steps to upgrade a Rails 3.2 application to Rails 4.

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          terminal
        
git checkout -b rails4
bundle update
bundle outdated
rspec .

          Gemfile
        
gem 'rails', '4.0.0.rc1'
gem 'sqlite3'

gem 'sass-rails',   '~> 4.0.0.rc1'
gem 'coffee-rails', '~> 4.0.0'
gem 'uglifier', '>= 1.3.0'

gem 'jquery-rails'

gem 'paper_trail', github: 'airblade/paper_trail', branch: 'rails4'

# add these gems to help with the transition:
gem 'protected_attributes'
gem 'rails-observers'
gem 'actionpack-page_caching'
gem 'actionpack-action_caching'

          config/application.rb
        
Bundler.require(:default, Rails.env)

# Remove:
# config.active_record.whitelist_attributes = false
# config.assets.enabled = true

          config/routes.rb
        
patch :update_many
# ...
get 'new', to: 'episodes#new'

          config/development.rb
        
config.eager_load = false

# Remove:
# config.whiny_nils = true
# config.action_dispatch.best_standards_support = :builtin
# config.active_record.mass_assignment_sanitizer = :strict
# config.active_record.auto_explain_threshold_in_seconds = 0.5
# config.assets.compress = false

          config/production.rb
        
config.eager_load = true
config.assets.js_compressor = :uglifier

          config/test.rb
        
config.eager_load = false

# Remove:
# config.whiny_nils = true
# config.active_record.mass_assignment_sanitizer = :strict

          config/initializers/secret_token.rb
        
Screencaster::Application.config.secret_token = '...'
Screencaster::Application.config.secret_key_base = '...'

          models/episode.rb
        
scope :published, -> { where('published_on <= ?', Time.now.to_date) }

          episodes_controller.rb
        
before_action :load_episode, only: [:show, :edit, :update, :destroy]

private

def episode_params
  params.require(:episode).permit(:description, :name, :seconds, :published_on, :timecode)
end