How to track utmz?

[andre8888]

I'm having issue with utmz (campaign referer tracking) and GA is reporting the source as DIRECT with one of our running campaigns. The cookies[:__utmz] is returning empty string. Here is the snippet of code:

gabba = Gabba::Gabba.new(Rails.application.config.ga_tracking_id,
Rails.application.config.ga_tracking_domain, request.env['HTTP_USER_AGENT'])
gabba.identify_user(cookies[:__utma], cookies[:__utmz])
gabba.referer request.env['HTTP_REFERER']
gabba.event(category, action, label, value)