# team_members.rb
ActiveAdmin.register TeamMember do
  permit_params :name, :gallery_images

  form partial: 'form'

  show do
    attributes_table do
      row :name
      row :gallery_images do
        ul do
          team_member.gallery_images.each do |gallery_image|
            li do
              image_tag url_for(gallery_image.gallery_images)
            end
          end
        end
      end
    end
  end
end

# _form.html.slim
= semantic_form_for [:admin, @team_member], builder: ActiveAdmin::FormBuilder do |f|
  = f.inputs do
    = f.input :name
    = f.input :gallery_images, as: :file, input_html: { multiple: true}
    = f.actions