Heya broadcasts sample code

broadcast.rb

class Heya::Broadcast < ApplicationRecord
  FROM_FORMATS = [
    /\A\[email protected]\z/,
    /\A.+ <\[email protected]>\z/
  ]

  validates_presence_of :subject, :body
  validate :valid_from_format

  def self.create_and_send(subject:, body:, users:, from: nil)
    broadcast = create!(from: from, subject: subject, body: body)
    users.find_each do |user|
      Heya::BroadcastMailer.with(user: user, broadcast: broadcast).build.deliver_later
    rescue => e
      warn "Got error for #{user.delivery_email} (#{user.id}):\n  #{e}"
    end
  end

  private

  def valid_from_format
    return if from.nil?
    return if FROM_FORMATS.any? { |f| from =~ f }
    errors.add(:from, "is invalid (must be a honeybadger.io sending domain)")
  end
end

broadcast_mailer.rb

class Heya::BroadcastMailer < ApplicationMailer
  DEFAULT_FROM = "The Honeybadger Crew <[email protected]>"
  default reply_to: "[email protected]"

  class UserUnsbuscribedError < StandardError
  end

  layout "heya/broadcast_mailer"
  rescue_from UserUnsbuscribedError do |e|
    Rails.logger.error(e.message)
  end

  def build
    broadcast = params.fetch(:broadcast)
    user = params.fetch(:user)

    @body = broadcast.body

    raise UserUnsbuscribedError.new("Unable to send mail: user unsubscribed") if user.opted_out?

    mail(
      from: broadcast.from.presence || DEFAULT_FROM,
      to: user.email,
      subject: broadcast.subject
    )
  end
end