Cancan and devise not working
class Ability
 include CanCan::Ability

  def initialize(user)
    user ||= User.new # guest user (not logged in)
    if user.clearance.equal?("2")
      can :create, Post
      can :manage, Post, :user_id => user.id
    else
      can :read, :all
    end
  end

end