Make queue used by ActionMailer job configurable

lib/devise/async.rb

@@ -1,13 +1,18 @@
 require 'devise'
 require 'devise/async/model'
 require 'devise/async/version'
+require 'action_mailer'
 
 module Devise
   module Async
     # Defines the enabled configuration that if set to false the emails will be sent synchronously
     mattr_accessor :enabled
     @@enabled = true
 
+    # Defines the queue in which the background job will be enqueued.
+    mattr_accessor :queue
+    @@queue = ActionMailer::Base.deliver_later_queue_name
+
     # Allow configuring Devise::Async with a block
     #
     # Example:

lib/devise/async/model.rb

@@ -50,7 +50,9 @@ def devise_pending_notifications
       private
 
       def deliver_mail_later(notification, model, args)
-        devise_mailer.send(notification, model, *args).deliver_later
+        devise_mailer.
+          send(notification, model, *args).
+          deliver_later(queue: Devise::Async.queue)
       end
     end
   end

spec/devise/async_spec.rb

@@ -10,4 +10,12 @@
     expect(described_class.enabled).to eq(false)
     described_class.enabled = initial_enabled
   end
+
+  it 'stores queue config' do
+    initial_queue = described_class.queue
+
+    described_class.queue = :critical
+    expect(described_class.queue).to eq(:critical)
+    described_class.queue = initial_queue
+  end
 end