Rails 4:使用AJAX调用更新模型属性

这是Rails 4上的后续问题：使用AJAX和Rails 4只更新一个参数的自定义操作：选择具有动态生成id的DOM元素。

我不知道如何从我得到的好答案中找到答案，所以我想从头开始

在我的Rails4应用程序中，我有一个Calendar和Post模型，用浅路由设置：

resources :calendars do
  resources :posts, shallow: true
end

日历has_many帖子和帖子belong_to是日历。

在日历show.html.erb视图中，我显示属于某个日历的所有帖子。

从这个日历show.html.erb视图中，我需要使用AJAX调用来更新帖子的：approvement参数，以便只刷新与该特定帖子的：approval相关的DOM元素，而不是整个页面。

这是日历show.html.erb中允许我更新帖子的:approval的代码部分：

<tr id="post_row_<%= post.id%>"> 
  [...]  # Truncated for brivety 
  <td class="cell_content_center post_approval_section">
    <% if post.approval == "ok" %>
      <span class="ok_green">
    <% else %>
      <span class="approval_blue" %>
    <% end %>
      <%= link_to post_path(:id => post.id, "post[approval]" => "ok", approval_update: true), remote: true, :method => :patch do %>
        <span class="glyphicon glyphicon-ok" data-toggle="tooltip" data-placement="left" title="Approve Post"></span>
      <% end %>
    </span><br/>
    <% if post.approval == "edit" %>
      <span class="edit_yellow">
    <% else %>
      <span class="approval_blue" %>
    <% end %>
      <%= link_to post_path(:id => post.id, "post[approval]" => "edit", approval_update: true), remote: true, :method => :patch do %>
      <span class="glyphicon glyphicon-repeat" data-toggle="tooltip" data-placement="left" title="Require Edits"></span>
    <% end %>
    </span><br/>
    <% if post.approval == "remove" %>
      <span class="remove_red">
    <% else %>
      <span class="approval_blue" %>
    <% end %>
      <%= link_to post_path(:id => post.id, "post[approval]" => "remove", approval_update: true), remote: true, :method => :patch do %>
      <span class="glyphicon glyphicon-remove" data-toggle="tooltip" data-placement="left" title="To Be Deleted"></span>
    <% end %>
    </span>
  </td>
  [...]  # Truncated for brivety
</tr>

然后，在posts_controller.rb:中

def update
    if params["approval_update"]
      respond_to do |format|
        if @post.update(post_params)
          format.js { render :action => "update_post_approval" }
        else
          format.html { redirect_to :back }
        end
      end
    else
      respond_to do |format|
        if @post.update(post_params)
          format.html { redirect_to post_path(@post) }
          format.json { render :show, status: :ok, location: @post }
          format.js
        else
          format.html { render :edit }
          format.json { render json: @post.errors, status: :unprocessable_entity }
        end
      end
    end
  end
  def update_post_approval
    respond_to do |format|
      format.js
    end
  end

注意：这里，我不能使用默认的Posts#Update操作，因为它已经被另一个AJAX调用用于从后show.html.erb视图更新:approval参数，这就是我们呈现update_post_approval自定义操作的原因。

然后，我有以下app/views/posts/update_post_approval.js.erb文件：

$("tr#post_row_#{post.id} > td.post_approval_section").html('<%= j render(partial: "calendars/post_approval") %>');

最后，我有以下calendars/_post_approval.html.erb部分：

<td class="cell_content_center post_approval_section">
  <% if post.approval == "ok" %>
    <span class="ok_green">
  <% else %>
    <span class="approval_blue" %>
  <% end %>
    <%= link_to post_path(:id => post.id, "post[approval]" => "ok", approval_update: true), remote: true, :method => :patch do %>
      <span class="glyphicon glyphicon-ok" data-toggle="tooltip" data-placement="left" title="Approve Post"></span>
    <% end %>
  </span><br/>
  <% if post.approval == "edit" %>
    <span class="edit_yellow">
  <% else %>
    <span class="approval_blue" %>
  <% end %>
    <%= link_to post_path(:id => post.id, "post[approval]" => "edit", approval_update: true), remote: true, :method => :patch do %>
    <span class="glyphicon glyphicon-repeat" data-toggle="tooltip" data-placement="left" title="Require Edits"></span>
  <% end %>
  </span><br/>
  <% if post.approval == "remove" %>
    <span class="remove_red">
  <% else %>
    <span class="approval_blue" %>
  <% end %>
    <%= link_to post_path(:id => post.id, "post[approval]" => "remove", approval_update: true), remote: true, :method => :patch do %>
    <span class="glyphicon glyphicon-remove" data-toggle="tooltip" data-placement="left" title="To Be Deleted"></span>
  <% end %>
  </span>
</td>

当我单击<td class="cell_content_center post_approval_section">部分中的三个链接之一来更新后:approval参数时，该参数实际上已经更新，正如我们在服务器日志中看到的：

Started PATCH "/posts/38?approval_update=true&post%5Bapproval%5D=ok" for ::1 at 2015-11-20 08:03:50 -0800
Processing by PostsController#update as JS
  Parameters: {"approval_update"=>"true", "post"=>{"approval"=>"ok"}, "id"=>"38"}
  User Load (1.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
  Post Load (0.7ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."id" = $1 LIMIT 1  [["id", 38]]
   (0.6ms)  BEGIN
  SQL (1.1ms)  UPDATE "posts" SET "approval" = $1, "updated_at" = $2 WHERE "posts"."id" = $3  [["approval", "ok"], ["updated_at", "2015-11-20 16:03:50.888587"], ["id", 38]]
  SQL (1.3ms)  INSERT INTO "versions" ("event", "object", "whodunnit", "created_at", "object_changes", "item_id", "item_type") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING "id"  [["event", "update"], ["object", "---'nid: 38'ncalendar_id: 6'ndate: 2015-11-17 22:09:00.000000000 Z'nsubject: Subject'nformat: Link'ncopy: https://www.wid.la/'ncreated_at: 2015-11-17 22:09:28.713416000 Z'nupdated_at: 2015-11-20 16:03:20.613597000 Z'nimage_file_name: 'nimage_content_type: 'nimage_file_size: 'nimage_updated_at: 'nshort_copy: '''nscore: 'nfacebook: true'ntwitter: false'ninstagram: false'npinterest: false'ngoogle: false'nlinkedin: false'ntumblr: 'nsnapchat: 'napproval: remove'n"], ["whodunnit", "1"], ["created_at", "2015-11-20 16:03:50.888587"], ["object_changes", "---'napproval:'n- remove'n- ok'nupdated_at:'n- 2015-11-20 16:03:20.613597000 Z'n- 2015-11-20 16:03:50.888587000 Z'n"], ["item_id", 38], ["item_type", "Post"]]
   (1.6ms)  COMMIT
  Rendered calendars/_post_approval.html.erb (0.1ms)
  Rendered posts/update_post_approval.js.erb (1.5ms)
Completed 200 OK in 27ms (Views: 9.9ms | ActiveRecord: 6.3ms)

但是，除非手动刷新页面，否则视图不会发生任何更改。

我现在已经花了几个小时在这个问题上，不知道这个问题是由Ruby还是JS代码引起的。

如果有必要，我很乐意分享更多的代码。

你知道我在这里做错了什么吗？