Snippet to deploy Rails 4. Don't use the Capistrano asset tasks.

deploy.rb

after "deploy:restart", "deploy:cleanup"

namespace :deploy do
  task :restart, :roles => :web do
    run "touch #{release_path}/tmp/restart.txt"
  end

  task :finalize_update, :roles => :web do
    run "RAILS_ENV=#{rails_env}"
    
    run "cd #{release_path}; RAILS_ENV=#{rails_env} bundle exec rake db:migrate"
    
    # Manually do this because Capistrano support is broken for Rails 4
    run "cd #{release_path}; RAILS_ENV=#{rails_env} bundle exec rake assets:precompile"
    
    run "chmod -R g+w #{release_path}"
  end
end