ruby-on-rails - Rails - 在索引 View 中显示相关数据

Question

我正在努力让 belongs_to 模型在索引页面的部分内容中正确迭代。

类:

class Chapter < ActiveRecord::Base
  attr_accessible :name, :chapter_num,
  belongs_to :chapter
  #fields: :id, :name, :chapter_num
end

class County < ActiveRecord::Base
  attr_accessible :name, :county_num, :chapter_id
  has_many :counties
  #fields: :id, :name, :county_num, :chapter_id
end

class ChaptersController < ApplicationController
  def index
    @chapters = Chapter.all
    @counties = County.all(:joins => :chapter, :select => "counties.*, chapters.id")
  end
end

app/views/chapters/index.html.erb:

<h1>Chapter Index</h1>
  <%= render @chapters %>
<br />
<%= link_to "Add a new Chapter", new_chapter_path, class: "btn btn-large btn-primary" %>

app/views/chapters/_chapter.html.erb:

<div class="row">
  <div class="span5 offset1"><h4><%= link_to chapter.name, edit_chapter_path(chapter.id) %></h4></div>
  <div class="span2"><h4><%= chapter.chapter_num %></h4></div>
</div>
<!-- here's where the problem starts -->
<% @counties.each do |county| %>
<div class="row">
  <div class="span4 offset1"><%= county.name %></div>
  <div class="span4 offset1"><%= county.county_num %></div>
  <div class="span2"><%= link_to 'edit', '#' %></div>
</div>
<% end %>
<%= link_to "New county", new_county_path %>
<hr>

当前代码显示如下截图。问题是它遍历所有县，而不仅仅是与给定章节关联的县。

我在索引 View 中，而不是在显示 View 中，如何在局部中添加章节特定变量，这将导致县根据 :chapter_id 字段进行迭代？

Answer 1

class ChaptersController < ApplicationController
  def index
    @chapters = Chapter.all
    # @counties = County.all(:joins => :chapter, :select => "counties.*, chapters.id")
  end
end

查看:

<% chapter.counties.each do |county| %>