在远程真实表单上使用simple_form呈现错误

Question

如果未通过验证，我正在尝试使用Ajax在表单上呈现错误。不幸的是，我的表单再次被渲染，但是没有错误提示。你能帮我弄清楚为什么吗？

_concours_form.html.erb

<%= simple_form_for @waiting_user, {id: 'concours-form', url: concours_path, remote: true} do |f| %>
  <%= f.text_field :email,
      class: "landing-form-input",
      autocomplete: "off",
      required: true,
      pattern: '[^@]+@[^@]+\.[a-zA-Z]{2,6}',
      placeholder: "Renseignez ton email ici"
    %>
  <i class="fa fa-envelope"></i>
  <%= f.hidden_field :concours_city,
      value:'',
      id: 'c-choosen-city'
    %>
  <%= f.hidden_field :source,
      value: params[:source]
    %>
  <%= f.button :submit,
      class: "landing-form-button",
      value: "Je tente ma chance !"
    %>
<% end %>

pages_controller.rb

def create_concours
    @email = waiting_list_params[:email]
    @waiting_user = WaitingList.new(waiting_list_params)
    respond_to do |format|
    if @waiting_user.save
        UserMailer.welcome(@email).deliver_now
        format.html { redirect_to concours_path }
        format.js
      else
        format.html
        format.js
      end
    end
  end

  private

  def waiting_list_params
    params.require(:waiting_list).permit(:email, :concours_city, :source)
  end

create_concours.js.erb

<% if @waiting_user.errors.any? %>
  refreshForm('<%= j render "pages/concours_form" %>');
<% end %>