Question

当我尝试通过单击编辑链接从其显示页面编辑子资源（课程）时，我遇到嵌套路由问题，如下所述。涉及两个类：单元和课程。我无法理解为什么Rails试图路由到课程控制器（单元的父母）。

非常感谢任何帮助。

我收到此错误并且网址

http://localhost:3000/units/3/lessons/13/edit
Routing Error

No route matches {:action=>"show", :controller=>"courses", :id=>nil}

配置/ routes.rb中 资源：课程资源：单位端

resources :units do
    resources :lessons
end

**来自佣金路线**

    unit_lessons GET    /units/:unit_id/lessons(.:format)            lessons#index
                 POST   /units/:unit_id/lessons(.:format)            lessons#create
 new_unit_lesson GET    /units/:unit_id/lessons/new(.:format)        lessons#new
edit_unit_lesson GET    /units/:unit_id/lessons/:id/edit(.:format)   lessons#edit
     unit_lesson GET    /units/:unit_id/lessons/:id(.:format)        lessons#show

点击链接的代码

<%= link_to "Edit Lesson", edit_unit_lesson_path(@unit, @lesson ) %>

LessonsController

class LessonsController < ApplicationController
  before_filter :find_unit
  before_filter :find_lesson, :only => [:show,:edit,:update,:destroy]
  .
  .
  .
private
def find_unit
  @unit = Unit.find(params[:unit_id])
end

def find_lesson
  @lesson = @unit.lessons.find(params[:id])
end

服务器日志文件

Started GET "/units/3/lessons/12/edit" for 127.0.0.1 at 2012-08-02 14:50:55 +0200
Processing by LessonsController#edit as HTML
    Parameters: {"unit_id"=>"3", "id"=>"12"}
    Unit Load (0.1ms)  SELECT "units".* FROM "units" WHERE "units"."id" = ? LIMIT 1  [["id", "3"]]
Lesson Load (0.1ms)  SELECT "lessons".* FROM "lessons" WHERE "lessons"."unit_id" = 3 AND     "lessons"."id" = ? LIMIT 1  [["id", "12"]]
Rendered lessons/_form.html.erb (3.4ms)
Rendered lessons/edit.html.erb within layouts/application (4.4ms)
Completed 500 Internal Server Error in 7ms

ActionController::RoutingError (No route matches {:action=>"show", :controller=>"courses", :id=>nil}):
app/views/lessons/edit.html.erb:8:in   `_app_views_lessons_edit_html_erb___3830769233446763788_70188197130200'

Answer 1

找到它。该链接是表体的一部分，使用.each迭代器构建。我需要将名称从“@lesson”更改为“lesson”，因为这是在构建表时引用的内容。

对于遇到类似问题的其他人，我已将功能代码放在下面。

<tbody>  
  <% @unit.lessons.each do |lesson| %>
    <tr>
      <td><%= link_to lesson.lesson_name, [@unit, lesson] %></td>
      .
      .
      .
      <td><%= link_to 'Edit', edit_unit_lesson_path(@unit, lesson ) %></td>
   </tr>
 <% end %>
 </tbody>

Rails路由到祖父母嵌套类

1 个答案: