acts_as_backdrop

This gem allows you to write async processing code to your models right into your models code.

Example

class Something < ActiveRecord::Base
  acts_as_backdrop

  def backdrop_process(message)

    # This will be processed asyncronously after model save.
    # Example that you receive as 'message' variable:
    #
    # { "class"   => "Something",
    #   "gid"     => "gid://dummy/Something/1",
    #   "changes" => {
    #     "title"      => [nil, "abc"],
    #     "created_at" => [nil, "2015-12-17T20:28:52.307Z"],
    #     "updated_at" => [nil, "2015-12-17T20:28:52.307Z"],
    #     "id"         => [nil, 1]
    #   }
    # }

  end

end

Why

Because you might need to process some data after the model is saved, asynchronously.

Installation

gem 'act_as_backdrop' # Gemfile
require 'backdrop'    # application.rb

How it works

When your model instance saved (on after_save callback), the model itself and it's changes published to async job queue as usual DelayedJob. The special worker (BackdropJob class) will process this message and will trigger your 'backdrop_process' method inside your model.

You receive full information about model changes, and can process it as you wish. If you change the model state at this step, the next async task will happen and be processed in same way.