Send email before destroy User, Rails 5

Question

I'm trying to hook a mailer before my User object is destroyed.

I am using Sidekiq to send emails but this error comes out when the User is destroyed.

ActiveJob::DeserializationError: Error while trying to deserialize arguments: Couldn't find User with id [id]

In my model I have this:

class User < ApplicationRecord
  before_destroy :goodbye_user

  devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable, :confirmable, :lockable

  private

  def send_devise_notification(notification, *args)
    devise_mailer.send(notification, self, *args).deliver_later
  end

  def goodbye_user
    GoodbyeUser.goodbye_user(self).deliver_later
  end

end

And farewell user mail never sends.

Any idea?

Answer 1

It's because you're sending the email asynchronously via deliver_later. Since it's on a separate thread, by the time the worker gets the job the user is already destroyed.

You can either send the email synchronously or don't use a before_destroy callback. If you'd like to send the email in the background, just call your goodbye_user method and destroy the user there (after the email is sent).