<%= form.label :files %> <%= form.file_field :files, disable: true, direct_upload: true, multiple: true, id: "directory_files", hide_label: true %> <% directory.files.each do |file| %> <% unless file.persisted? %> <%= hidden_field_tag "#{directory.model_name.param_key}[files][]", file.signed_id %> <% end %> <% end %>