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

这样定义的路由

resources :courses do
    resource :syllabuses
  end

我的 html 有一个 link 可以编辑教学大纲

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

rake routes 告诉我这个

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

服务器日志显示请求处理像

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" =  LIMIT 1  [["id", nil]]
Completed 404 Not Found in 2ms

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

如何将课程 ID 传递给课程控制器编辑操作？

Answer 1

既然你有一个has_many协会，你还需要resources :syllabuses（注意s）。

改变那个，重新启动服务器和运行下面的代码来查看所有路由：

bundle exec rake routes

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

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

您可以在 Raild guide

中阅读有关嵌套资源的更多信息

Rails 4 - 嵌套资源路由

Rails 4 - Nested resource routing

ruby-on-rails

ruby-on-rails-4