Capistrano: clone dev database to another stage (for example - cap staging mysql:clone_dev_db)

capistrano_mysql.rb

namespace :mysql do 
  task :clone_dev_db do
    require 'ostruct'
    db_config = OpenStruct.new(YAML.load_file("config/database.yml"))
    dev_db = db_config.development
    stage_db = db_config.send(stage)
    cmd = "mysqldump -u #{dev_db['username']} -h #{dev_db['host']} -p'#{dev_db['password']}' #{dev_db['database']} " +
    "--add-drop-table | mysql -u #{stage_db['username']} -p'#{stage_db['password']}' -h #{stage_db['host']} #{stage_db['database']}"
    run cmd
  end
end