Ruby on rails Rails在索引中显示非ID的字符串

我有以下表单，其中用户从活动中心页面上的数据库条目列表中选择一个部门。我正在尝试显示部门字符串（

：department

）而不是部门ID。我尝试了

@activity\u center.department.department

，但这不起作用。有什么建议吗

表格：

false%>

部门模式：

class Department < ActiveRecord::Base
    validates :department, :presence => true
    has_many :activity_centers
end

班级部门true
有很多：活动中心
结束

活动中心模型：

class ActivityCenter < ActiveRecord::Base
    validates :activity_center, :presence => true
    validates :department_id, :presence => true
    belongs_to :departments
end

class ActivityCentertrue
验证：部门id，：状态=>true
属于：部门
结束

活动中心索引页：

<% @activity_centers.each do |activity_center| %>
    <tr>
      <td><%= activity_center.activity_center %></td>
      <td><%= activity_center.department.department %></td>
      <td style="text-align:right;">
        <%= link_to 'View Activity Center',  activity_center_path(activity_center),      class: "btn btn-success btn-xs" %>
        <%= link_to 'Edit',           edit_activity_center_path(activity_center), class: "btn btn-default btn-xs" %>
        <%= link_to 'Delete',         activity_center_path(activity_center),      class: "btn btn-danger btn-xs",
            method: :delete,
            data: { confirm: 'Confirm you want to delete this activity_center.' } %></td>
    </tr>
  <% end %>

根据MZaragoza，这是一个打字错误<代码>属于应该是单数。

我的第一个问题是在“活动中心模型”中：“它是

属于：部门

还是

属于：部门

我想你是单数的！非常感谢你抓住了这个机会。

<% @activity_centers.each do |activity_center| %>
    <tr>
      <td><%= activity_center.activity_center %></td>
      <td><%= activity_center.department.department %></td>
      <td style="text-align:right;">
        <%= link_to 'View Activity Center',  activity_center_path(activity_center),      class: "btn btn-success btn-xs" %>
        <%= link_to 'Edit',           edit_activity_center_path(activity_center), class: "btn btn-default btn-xs" %>
        <%= link_to 'Delete',         activity_center_path(activity_center),      class: "btn btn-danger btn-xs",
            method: :delete,
            data: { confirm: 'Confirm you want to delete this activity_center.' } %></td>
    </tr>
  <% end %>