How to Integrate 'premailer' with Rails

Question

How does one integrate the 'premailer' gem with a Rails (3.0.7) project? I currently have in my mailer:

def welcome(user)
  @user = user

  mail to: user.email, subject: "Welcome"
end

But I can't figure out how to integrate the library. I need to call:

premailer = Premailer.new(html)
html = premailer.to_inline_css

However, I'm not sure how to access the contents of my email from a mailer action.

Answer 1

Try:

def premailer(message)
  message.text_part.body = Premailer.new(message.text_part.body.to_s, with_html_string: true).to_plain_text
  message.html_part.body = Premailer.new(message.html_part.body.to_s, with_html_string: true).to_inline_css

  return message
end

def welcome(user)
  @user = user

  message = mail to: user.email, subject: "Welcome"
end