Dead simple Mixpanel login/logout tracking for Devise Sessions Controllers

mixpanel_sessions_controller.rb

class Users::SessionsController < Devise::SessionsController

  before_action :set_tracker

  # POST /resource/sign_in
  def create
    super
    @tracker.people.set(current_user.id, {
        "$name"   => current_user.name,
        "$email"  => current_user.email,
        "class"   => current_user.cohort.name,
        "school"  => current_user.school.name,
        "role"    => current_user.role
      })
    @tracker.track(current_user.id, 'login')
  end

  # DELETE /resource/sign_out
  def destroy
    @tracker.track(current_user.id, 'logout')
    super
  end

  private

  def set_tracker
    # setup mixpanel tracker 
    @tracker = Mixpanel::Tracker.new(ENV['MIXPANEL_KEY'])
  end

end