Compile assets locally with Capistrano 3.8.1 and Rails 5.1.1

deploy.rb

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

namespace :deploy do

  desc 'Compile assets'
  task :compile_assets => [:set_rails_env] do
    # invoke 'deploy:assets:precompile'
    invoke 'deploy:assets:precompile_local'
    invoke 'deploy:assets:backup_manifest'
  end


  namespace :assets do

    desc "Precompile assets locally and then rsync to web servers"
    task :precompile_local do
      # compile assets locally
      run_locally do
        execute "RAILS_ENV=#{fetch(:stage)} bundle exec rake assets:precompile"
      end

      # rsync to each server
      dirs = {
        './public/assets/' => 'public/assets/',
        './public/packs/' => 'public/packs/'
      }
      on roles( fetch(:assets_roles, [:web]) ) do
        # this needs to be done outside run_locally in order for host to exist
        dirs.each do |local, remote|
          remote_dir = "#{host.user}@#{host.hostname}:#{release_path}/#{remote}"

          run_locally { execute "rsync -av --delete #{local} #{remote_dir}" }
        end
      end

      # clean up
      run_locally { execute "rm -rf #{dirs.keys.first}" }
    end

  end

end

thx for your job