CanCan rules in engines and main apps

ability.rb

# This is your main app/models/ability.rb file in your app
class Ability < Namespace::Ability
  def initialize(user)
    super

    # Main app CanCan rules
  end
end

engine_ability.rb

# This is in your engine under app/models/namespace/ability.rb
module Namespace
  class Ability
    include CanCan::Ability
    def initialize(user)
      # Engine CanCan rules
    end
  end
end