Rails 4-嵌套资源路由

Question

我有这样定义的课程和教学大纲模型

class Course < ActiveRecord::Base
    has_many :enrollments
    has_many :students, through: :enrollments, class_name: "User"
    has_many :syllabuses

end

class Syllabus < ActiveRecord::Base
    belongs_to :course
end

这样定义的路线

resources :courses do
    resource :syllabuses
  end

我的html有一个编辑教学大纲的链接。

<td><%= link_to "Edit", edit_course_syllabuses_path, class: "btn btn-primary"  %></td>

rake路线给我看这个

edit_course_syllabuses GET    /courses/:course_id/syllabuses/edit(.:format) syllabuses#edit

服务器日志显示请求处理如下

Started GET "/courses/46/syllabuses/edit" for ::1 at 2015-02-04 20:55:43 +0530
Processing by SyllabusesController#edit as HTML
  Parameters: {"course_id"=>"46"}
  Syllabus Load (0.3ms)  SELECT  "syllabuses".* FROM "syllabuses" WHERE "syllabuses"."id" = $1 LIMIT 1  [["id", nil]]
Completed 404 Not Found in 2ms

ActiveRecord::RecordNotFound - Couldn't find Syllabus with 'id'=:

如何将教学大纲id传递给教学大纲控制器编辑操作？

Answer 1

因为您有一个has_many关联，所以您还需要resources :syllabuses (注意s)。

更改它，重新启动服务器并运行以下代码以查看所有路由：

bundle exec rake routes

您的路径现在是edit_course_syllabuse，您可以这样使用它：

<%= link_to "Edit", edit_course_syllabuses_path(@syllabuse), class: "btn btn-primary"  %>

您可以阅读有关铁路导轨中嵌套资源的更多信息。