Rails Datatable ajax无法正常工作 - Rails 4

Question

所以我初始化了datatables gem ok并且它正常工作。我现在要弄清楚的是如何实现ajax api以便自动更新字段。

以下是我在application.js中的内容

$('#usertableadmin').DataTable({
      serverSide: true,
      ajax: 'users/',
      dom: 'T<"clear">lfrtip',
          tableTools: {
              "sSwfPath": "http://localhost:3000/swf/copy_csv_xls_pdf.swf",
              "aButtons": [
                  "copy",
                  "print",
                  {
                      "sExtends":    "collection",
                      "sButtonText": "Export",
                      "aButtons":    [ "csv", "xls",
                      {
                          "sExtends": "pdf",
                          "sPdfOrientation": "landscape",
                          "sPdfMessage": "Exported Users from website Database"
                      }
                    ]
                  },

              ]
          },
      responsive: true
    }).ajax.reload();

这是我的usercontroller索引操作，负责显示用户

def index
    @users = User.all
    respond_to do |format|
      format.html #new.html.erb
      format.json { render json: @users}
    end
    # @columns = User.column_names
  end

这是我的index.html.erb中的html

<% provide(:title, 'All users') %>
<h1>All users</h1>

<%= link_to "Back", admin_path %>
<table class="display responsive no-wrap text-center" id="usertableadmin">
  <thead>
    <tr>
      <th>id</th>
      <th>Username</th>
      <th>Email</th>
      <th>Activated?</th>
      <th>Admin?</th>
    </tr>
  </thead>
  <tbody>
    <% @users.each do |user| %>
      <tr>
        <td><%= user.id %></td>
        <td><%= best_in_place user, :name, url: "users/#{user.id}", cancel_button: 'X' %></td>
        <td><%= best_in_place user, :email, url: "users/#{user.id}" %></td>
        <td><%= best_in_place user, :activated, url: "users/#{user.id}" %></td>
        <td><%= best_in_place user, :admin, url: "users/#{user.id}" %></td>
      </tr>
    <% end %>
  </tbody>

</table>

虽然使用此配置列出了所有用户，但分页不起作用，我也在控制台中收到此错误

Uncaught TypeError: Cannot read property 'length' of undefined

我已经阅读了数据表ajax api reload方法，但似乎无法找到我的错误。