Rails wrapper for the premailer gem
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Premailer Rails 3 README

This gem is a no config solution for the wonderful Premailer gem to be used with Rails 3. It uses interceptors which were introduced in Rails 3 and tweaks all mails which are delivered and adds a plain text part to them and inlines all CSS rules into the HTML part.

By default it inlines all the CSS files that are linked to in the HTML:

<link type='text/css' ... />

Don't worry about the host in the CSS URL since this will be ignored.

If no CSS file is linked to in the HTML it will try to load a default CSS file email.css.

Every CSS file (including the default email.css) is loaded from within the app. The retrieval of the file depends on your assets configuration:

  • Rails 3.1 asset pipeline: It will load the compiled version of the CSS asset which is normally located in app/assets/stylesheets/.

  • Classic static assets: It will try to load the CSS file located in public/stylesheets/

  • Hassle: It will try to load the compiled CSS file located in the default Hassle location tmp/hassle/stylesheets/


Simply add the gem to your Gemfile in your Rails project:

gem 'premailer-rails3'

That's it!


The Premailer object has many options. Refer to its documentation for details. premailer-rails3 sets a couple options.

options = {
  :with_html_string => true,
  :css_string       => CSSHelper.css_for_doc(doc)

If you'd like to add to or change these options, just add an initializer to your app.

# config/initializers/premailer-rails3.rb
module PremailerRails
  module Options
    extend self
    def custom
      {:preserve_styles => true}

The PremailerRails::Options#custom hash will be merged (using merge!) with the premailer-rails3 options before instantiating the Premailer object.