我正在关注可排序列表上的 Railscast ，但我遇到了嵌套资源的问题。
在我的应用程序中，“项目”有许多“步骤”，我正在为“步骤”创建一个可排序的列表。
我将方法“排序”添加到步骤控制器，并在 尝试加载页面时收到错误未定义的局部变量或方法“sort_project_steps_url” 。如果我从 tbody 中删除 data-update-url，页面会正确加载。链接排序的正确方法是什么？
路线.rb：
resources :projects do
resources :steps
match "steps/:id" => "steps#number", :as => :number
collection {post :sort}
end
步骤控制器：
class StepsController < ApplicationController
before_filter :get_project
# Sorts steps
def sort
render nothing: true
end
private
# get_project converts the project_id given by the routing
# into an @project object
def get_project
@project = Project.find(params[:project_id])
end
end
步骤/show.html.erb：
<table id="stepTable">
<tbody data-update-url="<%= sort_project_steps_url(@project) %>">
</tbody>
</table>
我的 rake 路线如下（不确定为什么排序出现在项目而不是步骤下）：
admin_root /admin(.:format) admin/dashboard#index
batch_action_admin_admin_users POST /admin/admin_users/batch_action(.:format) admin/admin_users#batch_action
admin_admin_users GET /admin/admin_users(.:format) admin/admin_users#index
POST /admin/admin_users(.:format) admin/admin_users#create
new_admin_admin_user GET /admin/admin_users/new(.:format) admin/admin_users#new
edit_admin_admin_user GET /admin/admin_users/:id/edit(.:format) admin/admin_users#edit
admin_admin_user GET /admin/admin_users/:id(.:format) admin/admin_users#show
PUT /admin/admin_users/:id(.:format) admin/admin_users#update
DELETE /admin/admin_users/:id(.:format) admin/admin_users#destroy
admin_dashboard /admin/dashboard(.:format) admin/dashboard#index
batch_action_admin_images POST /admin/images/batch_action(.:format) admin/images#batch_action
admin_images GET /admin/images(.:format) admin/images#index
POST /admin/images(.:format) admin/images#create
new_admin_image GET /admin/images/new(.:format) admin/images#new
edit_admin_image GET /admin/images/:id/edit(.:format) admin/images#edit
admin_image GET /admin/images/:id(.:format) admin/images#show
PUT /admin/images/:id(.:format) admin/images#update
DELETE /admin/images/:id(.:format) admin/images#destroy
batch_action_admin_projects POST /admin/projects/batch_action(.:format) admin/projects#batch_action
admin_projects GET /admin/projects(.:format) admin/projects#index
POST /admin/projects(.:format) admin/projects#create
new_admin_project GET /admin/projects/new(.:format) admin/projects#new
edit_admin_project GET /admin/projects/:id/edit(.:format) admin/projects#edit
admin_project GET /admin/projects/:id(.:format) admin/projects#show
PUT /admin/projects/:id(.:format) admin/projects#update
DELETE /admin/projects/:id(.:format) admin/projects#destroy
batch_action_admin_steps POST /admin/steps/batch_action(.:format) admin/steps#batch_action
admin_steps GET /admin/steps(.:format) admin/steps#index
POST /admin/steps(.:format) admin/steps#create
new_admin_step GET /admin/steps/new(.:format) admin/steps#new
edit_admin_step GET /admin/steps/:id/edit(.:format) admin/steps#edit
admin_step GET /admin/steps/:id(.:format) admin/steps#show
PUT /admin/steps/:id(.:format) admin/steps#update
DELETE /admin/steps/:id(.:format) admin/steps#destroy
batch_action_admin_comments POST /admin/comments/batch_action(.:format) admin/comments#batch_action
admin_comments GET /admin/comments(.:format) admin/comments#index
POST /admin/comments(.:format) admin/comments#create
admin_comment GET /admin/comments/:id(.:format) admin/comments#show
new_admin_user_session GET /admin/login(.:format) active_admin/devise/sessions#new
admin_user_session POST /admin/login(.:format) active_admin/devise/sessions#create
destroy_admin_user_session DELETE|GET /admin/logout(.:format) active_admin/devise/sessions#destroy
admin_user_password POST /admin/password(.:format) active_admin/devise/passwords#create
new_admin_user_password GET /admin/password/new(.:format) active_admin/devise/passwords#new
edit_admin_user_password GET /admin/password/edit(.:format) active_admin/devise/passwords#edit
PUT /admin/password(.:format) active_admin/devise/passwords#update
project_steps GET /projects/:project_id/steps(.:format) steps#index
POST /projects/:project_id/steps(.:format) steps#create
new_project_step GET /projects/:project_id/steps/new(.:format) steps#new
edit_project_step GET /projects/:project_id/steps/:id/edit(.:format) steps#edit
project_step GET /projects/:project_id/steps/:id(.:format) steps#show
PUT /projects/:project_id/steps/:id(.:format) steps#update
DELETE /projects/:project_id/steps/:id(.:format) steps#destroy
project_number /projects/:project_id/steps/:id(.:format) steps#number
sort_projects POST /projects/sort(.:format) projects#sort
projects GET /projects(.:format) projects#index
POST /projects(.:format) projects#create
new_project GET /projects/new(.:format) projects#new
edit_project GET /projects/:id/edit(.:format) projects#edit
project GET /projects/:id(.:format) projects#show
PUT /projects/:id(.:format) projects#update
DELETE /projects/:id(.:format) projects#destroy
images GET /images(.:format) images#index
POST /images(.:format) images#create
new_image GET /images/new(.:format) images#new
edit_image GET /images/:id/edit(.:format) images#edit
image GET /images/:id(.:format) images#show
PUT /images/:id(.:format) images#update
DELETE /images/:id(.:format) images#destroy
root / projects#index