in _image.html.slim

              .box-img
                = check_box_tag "delete_img_ids[#{image.id.to_s}]", image.id, false, class: 'checkbox-input'
                span.check
                = label_tag "delete_img_ids[#{image.id}]", nil, class: 'checkbox-label'


in controller:
  def destroy_a
ttach
    attachments = ActiveStorage::Attachment.where(id: params[:delete_img_ids])
    attachments.map(&:purge)
    redirect_back(fallback_location: edit_admin_gallery_path)
  end