sending exceptions straight to slack

app.rb

require 'slack-notifier'

slack_notifier = Slack::Notifier.new HOOKURL, username: 'oh-noes'

rescue_from :all do |e|
  attachment = {
    fallback: "stacktrace",
    color: "danger",
    fields: e.backtrace.map {|line| {value: slack_notifier.escape(line), short: false}}
  }
  slack_notifier.ping "#{e.class.name}: #{e.message}", attachments: [attachment], icon_emoji: ":scream:"
end