MessageSenderObserver

message_sender_bserver.rb

class MessageSenderObserver < ActiveRecord::Observer
  observe :attendee

  def after_create(model)
    model.user.post_message(:all, I18n::t("messages.#{model.class.name.underscore}.create",
                                          :title => title_for(model),
                                          :link  => link_for(model)))
  end

private
  include Rails.application.routes.url_helpers

  def link_for(model)
    url = "#"

    case model.class.name
    when "Attendee"
      url = event_path(model.event)
    end

    Settings.application.hostname + url
  end

  def title_for(model)
    case model.class.name
    when "Attendee"
      model.event.subject
    else
      nil
    end
  end
end