rails_mailer_guide.md

Rails mailer guide

Notice

email styling is hard outlook-margins
url helper
config.action_mailer.asset_host
assets:precompile on sidekiq server
<img alt="" /> with image disabled by default
encrypt helper for token

Inline styles

<style> removed by different email clients
premailer
Premailer.new('<style>p { font-size: 11px; }</style><p>hello world</p>', with_html_string: true).to_inline_css
after_action: premailer
mailer/index.scss
@retain_style for extra <style types="text/css">...</style> (media query)
hack

def premailer
  if Rails.env.production?
    css_path = Rails.application.assets_manifest.assets['mailer/index.css']
    styles = File.open("#{Rails.root}/public/assets/#{css_path}", 'r').read
  else
    styles = Athena::Application.assets.find_asset('mailer/index.scss').source
  end

  if message.parts.empty?
    html = message.body.raw_source.to_str
  else
    html = message.html_part.body.raw_source.to_str
  end

  premailer = Premailer.new("<style>#{styles}</style>#{html}", with_html_string: true)
  output = premailer.to_inline_css
  output = output.gsub(%r{<style(.*)<\/style>}m, '') unless @retain_style

  part = Mail::Part.new(
    content_type: 'text/html; charset=utf-8',
    body: output
  )

  if message.parts.empty?
    message.body = part.decoded
  else
    message.html_part.body = part.decoded
  end
end

Foundation for Emails

foundation-emails
inky
guide
table layout

Email testing

rails mailer preview (spec/mailers/previews)
http://localhost:2000/rails/mailers/
https://litmus.com/checklist/emails/public/eb690d2

Cleanup

layout/mailer.html.erb, layout/meeting_mailer.html.erb
gem 'foundation_emails'

wangzuo/rails_mailer_guide.md

Rails mailer guide

Notice

Inline styles

Foundation for Emails

Email testing

Cleanup

Links