Capistrano 3 rails console tasks

deploy.rb

# encoding: UTF-8
# Place in config/deploy.rb
# See: https://gist.github.com/joost/9343156
# Adapted to work with rbenv
namespace :rails do
  desc "Open the rails console on primary app server"
  task :console do
    on roles(:app), primary: true do
      rails_env = fetch(:stage)
      execute_interactively "#{bundle_cmd} #{current_path}/script/rails console #{rails_env}"
    end
  end

  desc "Open the rails dbconsole on primary db server"
  task :dbconsole do
    on roles(:db), primary: true do
      rails_env = fetch(:stage)
      execute_interactively "#{bundle_cmd} #{current_path}/script/rails dbconsole #{rails_env}"
    end
  end

  def execute_interactively(command)
    user = fetch(:user)
    port = fetch(:port) || 22
    cmd = "ssh -l #{user} #{host} -p #{port} -t 'cd #{deploy_to}/current && #{command}'"
    info "Connecting to #{host}"
    exec cmd
  end

  def bundle_cmd
    if fetch(:rbenv_ruby)
      # FIXME: Is there a better way to do this? How does "execute :bundle" work?
      "RBENV_ROOT=#{fetch(:rbenv_path)} RBENV_VERSION=#{fetch(:rbenv_ruby)} #{File.join(fetch(:rbenv_path), '/bin/rbenv')} exec bundle exec"
    else
      "ruby "
    end
  end
end

Nice 'alternative' to clean this up: https://github.com/jetthoughts/j-cap-recipes/blob/master/lib/sshkit/backends/ssh_command.rb

The problem is when you have more than one server in the servers list, this task ^^^ will try to open the console in all of them. :/

A possible solution:

namespace :rails do
  desc 'Open a rails console `cap [staging] rails:console [server_index default: 0]`'
  task :console do
    on roles(:app) do |server|
      server_index = ARGV[2].to_i

      return if server != roles(:app)[server_index]

      puts "Opening a console on: #{host}...."

      cmd = "ssh #{server.user}@#{host} -t 'cd #{fetch(:deploy_to)}/current && RAILS_ENV=#{fetch(:rails_env)} bundle exec rails console'"

      puts cmd

      exec cmd
    end
  end
end

cap [staging] rails:console   # connect to the first server
cap [staging] rails:console 1 # connect to the second server

For bundle_cmd u can use map(:bundle) instead