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