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/Ruby on Rails 6.0

class ActiveJob::Base

Parent:
Object
Included modules:
ActiveJob::Core, ActiveJob::QueueAdapter, ActiveJob::QueueName, ActiveJob::QueuePriority, ActiveJob::Enqueuing, ActiveJob::Execution, ActiveJob::Callbacks, ActiveJob::Exceptions

Active Job

Active Job objects can be configured to work with different backend queuing frameworks. To specify a queue adapter to use:

ActiveJob::Base.queue_adapter = :inline

A list of supported adapters can be found in QueueAdapters.

Active Job objects can be defined by creating a class that inherits from the ActiveJob::Base class. The only necessary method to implement is the “perform” method.

To define an Active Job object:

class ProcessPhotoJob < ActiveJob::Base
  def perform(photo)
    photo.watermark!('Rails')
    photo.rotate!(90.degrees)
    photo.resize_to_fit!(300, 300)
    photo.upload!
  end
end

Records that are passed in are serialized/deserialized using Global ID. More information can be found in Arguments.

To enqueue a job to be performed as soon as the queuing system is free:

ProcessPhotoJob.perform_later(photo)

To enqueue a job to be processed at some point in the future:

ProcessPhotoJob.set(wait_until: Date.tomorrow.noon).perform_later(photo)

More information can be found in ActiveJob::Core::ClassMethods#set

A job can also be processed immediately without sending to the queue:

ProcessPhotoJob.perform_now(photo)

Exceptions

© 2004–2019 David Heinemeier Hansson
Licensed under the MIT License.