I'm sick with premailer-rails3 bugs so I make this fork which change the approach. Instead of trying to inject into ActionMailer delivery, it simply provide ActionMailer with a helper named inline_css(template_name) so you can do something like:
class MyMailer < ActionMailer::Base
def reminder
mail(to: '[email protected]', subject: "Hello World with inline CSS")
do |format|
format.html { inline_css("reminder") }
end
end
end
The inline_css helper do all the hard work: parse the content,
extract css link and do the sprockets stuff. Kudos to all this
hardwork goes to the original author fphilipe.
As far as I can see, this approach free me from the attachment headaches (https://github.com/fphilipe/premailer-rails3/issues/21) and the rspec headache (in which rspec won't see email content so it cannot verify)
Use it at your own risk :)
99.9% of the code is from premailer-rails3 so please refer to the original repo https://github.com/fphilipe/premailer-rails3 for details document. The only different is how you include it's in Gemfile :)
gem 'premailer-rails3', github: 'phuongnd08/premailer-rails3'