Rails 'nil' 不是与 ActiveModel 兼容的对象.它必须实现:to_partial_path.阿贾克斯

我正在按照第 4 节（服务器端问题）在页面上设置 ajax。 我已经完全复制了教程文本（用我自己的模型名称替换模型名称），它会创建并保存我的"参与者"记录，但不会自动刷新 ajax 部分。

这是我得到的错误...看起来它指的是我的创建.js.erb

ActionView::Template::Error ('nil' is not an ActiveModel-compatible object. It must implement :to_partial_path.):
    1: $("<%= escape_javascript(render @participant) %>").appendTo("#participants");
    2: // $('#participants').html("<%= j (render @participants) %>");
  app/views/participants/create.js.erb:2:in `_app_views_participants_create_js_erb___1675277149181037111_70181034249880'

这是我的代码

class ParticipantsController < ApplicationController
def new
  @participant = Participant.new
  @participants = @participants.recently_updated
end
def create
  @participant = Participant.new(participant_params)
  respond_to do |format|
    if @participant.save
      format.html { redirect_to @participant, notice: 'Helper Invited!' }
      format.js   {}
      format.json { render json: @participant, status: :created, location: @participant }
    else
      format.html { render action: "new" }
      format.json { render json: @participant.errors, status: :unprocessable_entity }
    end
  end
end

_form.html.erb

<ul id="participants">
  <%= render @participants %>
 </ul>
<%= form_for(@participant, remote: true) do |f| %>
  <%= f.label :email %><br>
  <%= f.email_field :email %>
<%= f.submit 'SUBMIT' %> 
 <script>
  $(document).ready(function() {
  return $("#new_participant").on("ajax:success", function(e, data, status, xhr) {
    return $("#new_participant").append(xhr.responseText);
  }).on("ajax:error", function(e, xhr, status, error) {
    return $("#new_participant").append("<p>Oops.  Please Try again.</p>");
  });
});
 </script>
 <script>
$(function() {
  return $("a[data-remote]").on("ajax:success", function(e, data, status, xhr) {
    return alert("The helper has been removed and notified.");
  });
});
</script>

_participant.html.erb

<li >
<%= participant.email %> <%= link_to participant, remote: true, method: :delete,  data: { confirm: 'Are you sure?' } do %>REMOVE<% end %>
</li>

创建.js.erb

$("<%= escape_javascript(render @participant) %>").appendTo("#participants");

销毁.js.erb

$('#participants').html("<%= j (render @participants) %>");