"Farm out" background jobs by running them immediately as one-off Heroku processes. No more managing database- or Redis-backed queues. Run many jobs in parallel without scaling workers. Pay for only the dyno-hours you use.
gem install farm
Set the environment variables API_KEY and APP_NAME to your Heroku API key and the name of your app on Heroku, respectively.
The installation is finished.
Add the following lines to your Rakefile:
require 'farm'
require 'farm/tasks'
The Rakefile must also define a task called 'environment'. This task should load your application so that the farmed-out method can be executed in context.
Foo.bar #=> Run directly
Foo.farm.bar #=> Run in background as one-off Heroku process.
For local development, set the environment variable FARM_ENV=local. This will cause background tasks to be run as local rake tasks, rather than one-off Heroku processes.
The farm method stores your method call and serializes it to YAML. A Heroku API call then sends the serialized object via the CMD environment variable to a rake task called farm:run that deserializes the object and runs the stored method.
Sincere thanks to https://github.com/collectiveidea/delayed_job from which I copied lots of code and functionality.