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Mandrill::Rails extends the capabilities of the Mandrill gem to provide tighter integration for Rails projects.

The primary goal of Mandrill::Rails is to make supporting Mandrill web hooks as easy and Rails-native as possible. As other opportunities for better Rails integration of the Mandrill API are discovered, these may be rolled in too.

FYI, Mandrill is the transactional email service by the same folks who do MailChimp.

Requirements and Known Limitations

  • Tested with MRI 1.8.7, 1.9.2, 1.9.3, Rubinius (1.8 and 1.9 mode), JRuby (1.8 and 1.9 mode)

  • Requires Rails >= 3.0.3 (including 3.1 and 3.2)

  • Includes Mandrill ~> 0.0.2 as a dependency

Food for thought (upcoming features maybe)..

  • some generators may be handy to avoid the manual coding to hook up web hooks

  • I thought about implementing this as an engine, but the overhead did not seem appropriate. Maybe that view will change..

The Mandrill::Rails Cookbook

How do I install it for normal use?

Add this line to your application's Gemfile:

gem 'mandrill-rails'

And then execute:

$ bundle

Or install it yourself as:

$ gem install mandrill-rails

How do I install it for gem development?

If you want to work on enhancements of fix bugs in Mandrill::Rails, fork and clone the github repository. If you are using bundler (recommended), run bundle to install development dependencies.

See the section below on 'Contributing to Mandrill::Rails' for more information.

How do I configure my app for incoming Mandrill WebHooks?

Say we have configured Mandrill to send requests to /inbox at our site (see the next recipes for how you do that).

Once we have Mandrill::Rails in our project, we just need to do two things. There's no generator to help you do this at the moment, but it is pretty simple:

First, configure a resource route:

resource :inbox, :controller => 'inbox', :only => [:show,:create]

Next, create the corresponding controller:

class InboxController < ApplicationController
  include Mandrill::Rails::WebHookProcessor

That's all for the basic do-nothing endpoint setup. Note that we need both the GET and POST routes (Mandrill sends data to the POST route, but it uses GET to test the availability of the endpoint).

You can setup as many of these controllers as you need, if you wish different types of events to be handled by different routes.

How do I configure Mandrill to send inbound email to my app?

See Mandrill Inbound Domains

  • enter the mail route you want to match on e.g. *

  • set the WebHook enpoint to match e.g.

How do I configure Mandrill to send WebHook requests to my app?

See Mandrill WebHooks

  • select the events you want to trigger on

  • set the “Post to URL” to point to your controller e.g.

How do I handle a specific Mandrill event payload in my app?

Once you have configured Mandrill and setup your routes and controllers, we can successfully receive WebHook event notifications from Mandrill. But we are not doing anything with the payload yet.

To handle specific Mandrill event payloads, we just need to implement a handler for each event type we are interested in.

The list of available event types includes: inbound, send, hard_bounce, soft_bounce, open, click, spam, unsub, and reject.

In our controller, we simply write a method called handle_<event-type> and it will be called for each event payload received. The event payload will be passed to this method as an Mandrill::WebHook::EventDecorator - basically a Hash with some additional methods to help extract payload-specific elements.

For example, to handle inbound email:

class InboxController < ApplicationController
  include Mandrill::Rails::WebHookProcessor

  def handle_inbound(event_payload)


If the handling of the payload may be time-consuming, you could throw it onto a background queue at this point instead.

Note that Mandrill may send multiple event payloads in a single request, but you don't need to worry about that. Each event payload will be unpacked from the request and dispatched to your handler individually.

And if you don't care to handle a specific payload type - then just don't implement the associated handler.

How do I use Mandrill gem features with Mandrill::Rails?

Mandrill is included with Mandrill::Rails and its behaviour is unchanged. You can use all the features of the Mandrill gem as normal.

Contributing to Mandrill::Rails

  • Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet

  • Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it

  • Fork the project

  • Start a feature/bugfix branch

  • Commit and push until you are happy with your contribution

  • Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.

  • Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.


Copyright © 2012 Paul Gallagher. See LICENSE for further details.

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