Rake Task as a Delayed Job

Here's an example how to trigger rake tasks with delayed_job. Create the following file and require it from the application.rb or environment.rb

# lib/delayed_rake.rb
class DelayedRake < Struct.new(:task, :options)
  def perform
    env_options = ''
    options && options.stringify_keys!.each do |key, value|
      env_options << " #{key.upcase}=#{value}"
    end
    system("cd #{Rails.root} && RAILS_ENV=#{Rails.env} bundle exec rake #{task} #{env_options} >> log/delayed_rake.log")
  end
end

Then you can put it on the queue like so:

Delayed::Job.enqueue(DelayedRake.new("paperclip:refresh:metadata", :class => 'Avatar'))