Delayed extensions allow method calls to be executed asynchronously. By default, all class methods can be executed asynchronously. In Rails application, you can make ActiveRecord method calls and ActionMailer deliveries asynchronous.
delay to deliver your emails asynchronously. Use
delay_until(time) to deliver the email at some point in the future.
UserMailer.delay.welcome_email(@user.id) UserMailer.delay_for(5.days).find_more_friends_email(@user.id) UserMailer.delay_until(5.days.from_now).find_more_friends_email(@user.id)
You can also easily extend the devise gem to send emails using sidekiq.
delay_until(time) to asynchronously execute arbitrary methods on your ActiveRecord instance or classes.
User.delay.delete_old_users('some', 'params') @user.delay.update_orders(1, 2, 3) User.delay_for(2.weeks).whatever User.delay_until(2.weeks.from_now).whatever
I strongly recommend avoiding delaying methods on instances. This stores object state in Redis which can get out of date, causing stale data problems.
Any class method can be delayed via the same methods as above:
MyClass.delay.some_method(1, 'bob', true)
Just remember to keep the method arguments simple, don't pass complex Ruby objects.
You can tune the worker options used with a
.delay call by passing in options:
MyClass.delay(:retry => false).some_method(1, 2, 3) MyClass.delay(:queue => 'low').some_method(1, 2, 3) MyClass.delay_for(10.minutes, :retry => false).some_method(1, 2, 3)
The delay extensions can conflict with DelayedJob if you want to run both in the same process. You can disable them in a Rails application by calling
Sidekiq.remove_delay! in an initializer. This will prevent the delay extension modules from ever being loaded. If you would like to include the delay extensions prefixed with
Sidekiq.hook_rails! first in your initializer:
# config/initializers/sidekiq.rb # Sidekiq.hook_rails! # uncomment if you want the delay extensions, but prefixed with `sidekiq_` Sidekiq.remove_delay!
If you are using Sidekiq outside of a Rails application, the class method extensions are always loaded.