def show
    @brand = Brand.state.find_by_uri! params[:brand_id]
    @letter = @brand.letter

    @system = @brand.systems.state.find_by_uri! params[:id]
    @systems = @brand.systems.state.exclude(@system.id)

    add_breadcrumb 'Бренды', brands_path
    add_breadcrumb @letter.value, brands_path(:letter_id => @letter_id)
    add_breadcrumb @brand, brand_path(@brand)
    add_breadcrumb 'Системы', brand_systems_path(@brand)
    add_breadcrumb @system, brand_system_path(@brand, @system)

    title 'Бренды'
    title @brand
    title 'Системы'
    title @system
  end