ResqueMailer
A gem plugin which allows messages prepared by ActionMailer to be delivered asynchronously. Assumes you're using Resque (http://github.com/defunkt/resque) for your background jobs.
Note that recent (2.0+) versions of Resque::Mailer only work with Rails 3.x. For a version compatible with Rails 2, specify v1.x in your Gemfile.
Usage
Include Resque::Mailer in your ActionMailer subclass(es) like this:
class MyMailer < ActionMailer::Base
include Resque::Mailer
end
Now, when MyMailer.subject_email(params).deliver
is called, an entry
will be created in the job queue. Your Resque workers will be able to deliver
this message for you. The queue we're using is imaginatively named +mailer+,
so just make sure your workers know about it and are loading your environment:
QUEUE=mailer rake environment resque:work
Note that you can still have mail delivered synchronously by using the bang method variant:
MyMailer.subject_email(params).deliver!
Oh, by the way. Don't forget that your async mailer jobs will be processed by a separate worker. This means that you should resist the temptation to pass database-backed objects as parameters in your mailer and instead pass record identifiers. Then, in your delivery method, you can look up the record from the id and use it as needed.
If you want to set a different default queue name for your mailer, you can
change the default_queue_name
property like so:
# config/initializers/resque_mailer.rb
Resque::Mailer.default_queue_name = 'application_specific_mailer'
This is useful when you are running more than one application using resque_mailer in a shared environment. You will need to use the new queue name when starting your workers.
QUEUE=application_specific_mailer rake environment resque:work
Using with Resque Scheduler
If resque-scheduler is
installed, two extra methods will be available: deliver_at
and deliver_in
.
These will enqueue mail for delivery at a specified time in the future.
# Delivers on the 25th of December, 2012
MyMailer.reminder_email(params).deliver_at(Time.parse('2012-12-25'))
# Delivers in 7 days
MyMailer.reminder_email(params).deliver_in(7.days)
Resque::Mailer as a Project Default
If you have a variety of mailers in your application and want all of them to use Resque::Mailer by default, you can subclass ActionMailer::Base and have your other mailers inherit from an AsyncMailer:
# config/initializers/resque_mailer.rb
class AsyncMailer < ActionMailer::Base
include Resque::Mailer
end
# app/mailers/example_mailer.rb
class ExampleMailer < AsyncMailer
def say_hello(user)
# ...
end
end
Installation
Install it as a plugin or as a gem plugin from Gemcutter:
gem install resque_mailer
script/plugin install git://github.com/zapnap/resque_mailer.git
# Rails 3: add it to your Gemfile
gem 'resque_mailer'
Testing
You don't want to be sending actual emails in the test environment, so you can configure the environments that should be excluded like so:
# config/initializers/resque_mailer.rb
Resque::Mailer.excluded_environments = [:test, :cucumber]
Note: Define current_env
if using Resque::Mailer in a non-Rails project:
Resque::Mailer.current_env = :production
Note on Patches / Pull Requests
- Fork the project.
- Make your feature addition or bug fix.
- Add tests for it. This is important so I don't break it in a future version unintentionally.
- Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
- Send me a pull request. Bonus points for topic branches.
Credits
Developed by Nick Plante with help from a number of contributors.