= simple_form_for(@images_car) do |f|
  = f.error_notification

  .form-inputs
    - if params[:car]
      - param = params[:car]
    - else
      - param = @images_car.car_id
    = f.input :car_id, as: :hidden, input_html: { value: param }
    = f.input :position, as: :hidden, input_html: { value: @car_position }
    = f.input :image

  .form-actions
    = f.button :submit