从另一个表中提取数据。

<% @checkouts.reverse.each do |checkout| %>
  <tr>
    <td><%= checkout.radio_num %></td>
    <th colspan="3"></th>
    <td><%= checkout.badge %></td>
    <th colspan="3"></th>
  </tr>
    <% @staffs.each do |staff| %>
        <% if checkout.badge == staff.badge %>
        <tr>
            <td><%= staff.name %></td>
            <th colspan="3"></th>
            <td><%= staff.dept %></td>
        </tr>
        <% end %>
    <% end %>   
  <tr>
    <td><%= link_to 'Edit', edit_checkout_path(checkout) %></td>
    <td><%= link_to 'Destroy', checkout, method: :delete, data: { confirm: 'Are you sure?' } %></td>
  </tr>
<% end %>
<% @checkouts.reverse.each do |checkout| %>
  <