introduce ActionMailer mixin

[hired]

introduce ActionMailer mixin

[sirwolfgang]

This issue has been sitting for awhile. Can this code be extracted and shared? How different is it from Subscribable?

[sirwolfgang]

Looking the current mailer worker code, I am not entirely sure how that is supposed to be used? The specs make it look like you need to create a worker per email, which doesn't seem right to me.

That said, the regular subscriber mixin looks to work if you change the class_exec to be an instance_exec like this:

mailer.run_callbacks(:process_action) do
  if action.is_a?(Symbol)
    mailer.public_send(action, event)
  else
    mailer.instance_exec(event, &action)
  end
end

Then all the binding for the view like @user = event.actor bind correctly. I still need to run an integration test to make sure the emails get out the door, but all my specs are working.