railsadminteam/rails_admin

<% field.attachments.each_with_index do |attachment, i| %>
  <div class="<%= field.reorderable? ? 'sortables' : '' %> toggle mb-2">
    <%= attachment.pretty_value %>
    <% if field.delete_method || field.keep_method %>
      <a class="btn btn-info btn-remove-image" data-toggle="button" href="#" role="button">
        <i class="fas fa-trash"></i>
        <%= I18n.t('admin.form.delete_file', field_label: field.label, number: i + 1) %>
      </a>
      <% if field.keep_method %>
        <%= form.check_box(field.keep_method, {multiple:true, checked: true, style: 'display:none;'}, attachment.keep_value, nil) %>
      <% elsif field.delete_method %>
        <%= form.check_box(field.delete_method, {multiple:true, style: 'display:none;'}, attachment.delete_value, nil) %>
      <% end %>
    <% end %>
  </div>
<% end %>
<%= form.file_field(field.name, { data: { :"multiple-fileupload" => true }, multiple: true }.deep_merge(field.html_attributes)) %>
<% if field.cache_method %>
  <%= form.hidden_field(field.cache_method) %>
<% end %>