如何设置 Rails ActionMailer 的优先级

Question

How to set priority of Rails ActionMailer?

UserMailer.test.deliver_later

I use DelayedJob to queue_adapter.

config.active_job.queue_adapter = :delayed_job

Answer 1

For Rails 6:

# config/initializers/set_mail_delivery_job_priority.rb
ActionMailer::MailDeliveryJob.priority = 0

References:

• https://github.com/rails/rails/blob/v6.1.0/activejob/lib/active_job/core.rb#L85
• https://github.com/rails/rails/blob/v6.1.0/activejob/lib/active_job/queue_priority.rb#L32

Answer 2

Aren't all mails sent on the "mailers" queue? If so, you can simply tell DJ the priority for said queue:

(bundle exec) sidekiq ... -q mailers,2 ...