What is the client ID when sending tracking data to google analytics via the measurement protocol?

Question

I want to use Google\'s new measurement protocol for sending tracking events from my server instead of JavaScript.

This page says the client ID is required: https://

Answer 1

In Rails:

  def save_google_analytics_client_id
    if current_user && cookies["_ga"]
      client_id = cookies["_ga"].split(".").last(2).join(".")
      if current_user.google_analytics_client_id != client_id
        current_user.google_analytics_client_id = client_id
        current_user.save
      end
    end
  end