How to send email asynchronously using Devise and Rails3
Hello everyone.
I’d show a workaround to send email asynchronously using Devise and Rails3.
Suppose we have already up and running our application with Devise and delayed_job correctly installed.
A first attempt was to add in config/initializers the following file (devise_async.rb):
module Devise
module Models
module Confirmable
handle_asynchronously :send_confirmation_instructions
end
module Recoverable
handle_asynchronously :send_reset_password_instructions
end
module Lockable
handle_asynchronously :send_unlock_instructions
end
end
end
This workaround has worked in part: the send method has been properly enqueued in the database, but when delayed_job tries to fire the job, the following error is raised:
[Worker(host:stefano-desktop pid:13153)]
As you can see, the job is trying to call the wrong send method: send_confirmation_instructions_without_delay.
At this point, I’ve implemented an even more dirty hack, overriding Devise’e methods using the syntax specified by intridea to send emails in the background:
module Devise
module Models
module Confirmable
# Send confirmation instructions by email
def send_confirmation_instructions
generate_confirmation_token! if self.confirmation_token.nil?
::Devise.mailer.delay.confirmation_instructions(self)
end
end
module Recoverable
# Resets reset password token and send reset password instructions by email
def send_reset_password_instructions
generate_reset_password_token!
::Devise.mailer.delay.reset_password_instructions(self)
end
end
module Lockable
# Send unlock instructions by email
def send_unlock_instructions
::Devise.mailer.delay.unlock_instructions(self)
end
end
end
end
This solution, however, is too tied to the implementation of Devise and is therefore not a good one (besides being really really dirty).
The latest idea, which represents the solution I’ve used is implemented as follows: use the alias_method in this way:
module Devise
module Models
module Confirmable
alias_method :send_confirmation_instructions_without_delay, :send_confirmation_instructions
handle_asynchronously :send_confirmation_instructions
end
module Recoverable
alias_method :send_reset_password_instructions_without_delay, :send_reset_password_instructions
handle_asynchronously :send_reset_password_instructions
end
module Lockable
alias_method :send_unlock_instructions_without_delay, :send_unlock_instructions
handle_asynchronously :send_unlock_instructions
end
end
end
This latest hack works a treat; is not the best but let you send mail with Devise asynchronously.
If you have any better solutions, do not hesitate to share!
March 23rd, 2011 - 02:58
Hi Stefano,
For me your first attempt worked. Do you know why it didn’t work for you? As in why was it looking for send_confirmation_instructions_without_delay instead of send_confirmation_instructions. Which version of devise and delayed_job are you using?
Thanks
June 14th, 2011 - 09:06
yes first solution also works for me