before "deploy:migrate", 'db:backup'
 
namespace :db do 
  
  desc "Crea un backup de la base de datos antes de correr migraciones"
  task :backup do 
    run "mkdir -p #{current_path}/db/backups"
    run "mysqldump -u root -p #{application}_production | gzip > #{current_path}/db/backups/#{application}_production_#{Time.now.strftime '%Y%m%dT%:%H%M%S'}.gzip" do |ch, stream, out|
      ch.send_data "the password" if out == "Enter password: "
    end
  end
end