Rails 4, Capistrano 3.2.1+ local precompilation using rsync

deploy.rb

  # Clear existing task so we can replace it rather than "add" to it.
  Rake::Task["deploy:compile_assets"].clear 

  desc "Precompile assets locally and then rsync to web servers" 
  task :compile_assets do 
    on roles(:web) do 
      rsync_host = host.to_s 
 
      run_locally do 
        with rails_env: :production do ## Set your env accordingly.
          execute :bundle, "exec rake assets:precompile" 
        end 
        execute "rsync -av --delete ./public/assets/ #{fetch(:user)}@#{rsync_host}:#{shared_path}/public/assets/" 
        execute "rm -rf public/assets" 
        # execute "rm -rf tmp/cache/assets" # in case you are not seeing changes 
      end 
    end 
  end

thx