How to run custom rake task via capistrano 3? - ruby-on-rails

Question

which way, i can run rake commands via capistrano on remote server.
for example i have a lib/task/reparse.rake with some methods
desc "it's take csv file, makes some changes and fill db with this info"
task :example1 => :environment do
require 'csv'
rows_to_insert = []
# some actions
# ...
end
on local server all is fine - i just run rake reparse:example1
and it's work(fill db correctly).
so question is - how can i run this command on real hosting, after deploy?
i'am using rails 4.1 + capistrano 3.
P.S. examples from site not work for me
How do I run a rake task from Capistrano?
if i try cap production rake:invoke task=reparse:land
it fails with:
cap aborted!
Don't know how to build task 'rake:invoke'
some fixes
namespace :somenamespace do
task :runrake do
on roles(:all), in: :sequence, wait: 5 do
within release_path do
execute :rake, ENV['task'], "RAILS_ENV=production"
end
end
end
end
with such way it begin to execute via
cap production somenamespace:runrake task=custom_task_file:custom_method1

Answer 1

Based on the capistrano/rails gem: https://github.com/capistrano/rails/blob/master/lib/capistrano/tasks/migrations.rake
namespace :somenamespace do
task :runrake do
on roles(:all) do
within release_path do
with rails_env: fetch(:rails_env) do
execute :rake, ask :task
end
end
end
end
end

Answer 2

You can create a corresponding capistrano task to run a specific rake task like that:
namespace :guests do
desc 'Remove guest users older than 7 days'
task :clean do
on roles(:app) do
within release_path do
with rails_env: fetch(:rails_env) do
execute :rake, 'guests:delete_old_guest_users'
end
end
end
end
end

Answer 3

So I have been working on this. it seams to work well. However you need a formater to really take advantage of the code.
If you don't want to use a formatter just set the log level to to debug mode.
SSHKit.config.output_verbosity = Logger::DEBUG
Cap Stuff
namespace :invoke do
desc 'Run a bash task on a remote server. cap environment invoke:bash[\'ls -la\'] '
task :bash, :execute do |_task, args|
on primary :app do
within deploy_to do
with rails_env: fetch(:rails_env) do
SSHKit.config.format = :supersimple
execute args[:execute]
end
end
end
end
desc 'Run a rake task on a remote server. cap environment invoke:rake[\'db:migrate\'] '
task :rake, :task do |_task, args|
on primary :app do
within current_path do
with rails_env: fetch(:rails_env) do
SSHKit.config.format = :supersimple
rake args[:task]
end
end
end
end
end
This is the formatter I built to work with the code above. It is based off the :textsimple built into the sshkit but it is not a bad way to invoke custom tasks. Oh this many not works with the newest version of sshkit gem. I know it works with 1.7.1. I say this because the master branch has changed the SSHKit::Command methods that are available.
module SSHKit
module Formatter
class SuperSimple < SSHKit::Formatter::Abstract
def write(obj)
case obj
when SSHKit::Command then write_command(obj)
when SSHKit::LogMessage then write_log_message(obj)
end
end
alias :<< :write
private
def write_command(command)
unless command.started? && SSHKit.config.output_verbosity == Logger::DEBUG
original_output << "Running #{String(command)} #{command.host.user ? "as #{command.host.user}#" : "on "}#{command.host}\n"
if SSHKit.config.output_verbosity == Logger::DEBUG
original_output << "Command: #{command.to_command}" + "\n"
end
end
unless command.stdout.empty?
command.stdout.lines.each do |line|
original_output << line
original_output << "\n" unless line[-1] == "\n"
end
end
unless command.stderr.empty?
command.stderr.lines.each do |line|
original_output << line
original_output << "\n" unless line[-1] == "\n"
end
end
end
def write_log_message(log_message)
original_output << log_message.to_s + "\n"
end
end
end
end

Answer 4

you need to load a custom rake task in Capistrano config:
# config/deploy.rb || config/deploy/production.rb
load 'lib/task/reparse.rake'
check for new task in console cap -T

Answer 5

Try capistrano-rake
Without messing with custom capistrano tasks or going into much detail, all you need to do is simply install the gem and you can start executing rake tasks on remote servers like this:
$ cap production invoke:rake TASK=some:rake_task