4
在我的Rails 4的应用程序中，有四种模式：Rails 4嵌套浅层路由：如何在子控制器中获取父ID？
class User < ActiveRecord::Base
has_many :administrations
has_many :calendars, through: :administrations
end
class Calendar < ActiveRecord::Base
has_many :administrations
has_many :users, through: :administrations
has_many: :posts
end
class Administration < ActiveRecord::Base
belongs_to :user
belongs_to :calendar
end
class Post < ActiveRecord::Base
belongs_to :calendar
end
有了这个路由：
Rails.application.routes.draw do
root to: 'pages#home'
devise_for :users, :path => 'account'
resources :calendars do
resources :posts, shallow: true
end
end
哪个给出了这些路线：
Prefix Verb URI Pattern Controller#Action
posts GET /posts(.:format) posts#index
POST /posts(.:format) posts#create
new_post GET /posts/new(.:format) posts#new
edit_post GET /posts/:id/edit(.:format) posts#edit
post GET /posts/:id(.:format) posts#show
PATCH /posts/:id(.:format) posts#update
PUT /posts/:id(.:format) posts#update
DELETE /posts/:id(.:format) posts#destroy
root GET / pages#home
new_user_session GET /account/sign_in(.:format) devise/sessions#new
user_session POST /account/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /account/sign_out(.:format) devise/sessions#destroy
user_password POST /account/password(.:format) devise/passwords#create
new_user_password GET /account/password/new(.:format) devise/passwords#new
edit_user_password GET /account/password/edit(.:format) devise/passwords#edit
PATCH /account/password(.:format) devise/passwords#update
PUT /account/password(.:format) devise/passwords#update
cancel_user_registration GET /account/cancel(.:format) devise/registrations#cancel
user_registration POST /account(.:format) devise/registrations#create
new_user_registration GET /account/sign_up(.:format) devise/registrations#new
edit_user_registration GET /account/edit(.:format) devise/registrations#edit
PATCH /account(.:format) devise/registrations#update
PUT /account(.:format) devise/registrations#update
DELETE /account(.:format) devise/registrations#destroy
user_confirmation POST /account/confirmation(.:format) devise/confirmations#create
new_user_confirmation GET /account/confirmation/new(.:format) devise/confirmations#new
GET /account/confirmation(.:format) devise/confirmations#show
user_unlock POST /account/unlock(.:format) devise/unlocks#create
new_user_unlock GET /account/unlock/new(.:format) devise/unlocks#new
GET /account/unlock(.:format) devise/unlocks#show
calendar_posts GET /calendars/:calendar_id/posts(.:format) posts#index
POST /calendars/:calendar_id/posts(.:format) posts#create
new_calendar_post GET /calendars/:calendar_id/posts/new(.:format) posts#new
GET /posts/:id/edit(.:format) posts#edit
GET /posts/:id(.:format) posts#show
PATCH /posts/:id(.:format) posts#update
PUT /posts/:id(.:format) posts#update
DELETE /posts/:id(.:format) posts#destroy
calendars GET /calendars(.:format) calendars#index
POST /calendars(.:format) calendars#create
new_calendar GET /calendars/new(.:format) calendars#new
edit_calendar GET /calendars/:id/edit(.:format) calendars#edit
calendar GET /calendars/:id(.:format) calendars#show
PATCH /calendars/:id(.:format) calendars#update
PUT /calendars/:id(.:format) calendars#update
DELETE /calendars/:id(.:format) calendars#destroy
最后，这里是内容posts_controller.rb：
class PostsController < ApplicationController
before_action :set_post, only: [:show, :edit, :update, :destroy]
# GET /posts
# GET /posts.json
def index
@posts = Post.all
end
# GET /posts/1
# GET /posts/1.json
def show
end
# GET /posts/new
def new
@post = Post.new
end
# GET /posts/1/edit
def edit
end
# POST /posts
# POST /posts.json
def create
@calendar = Calendar.find(params[:calendar_id])
@post = @calendar.posts.create(post_params)
respond_to do |format|
if @post.save
format.html { redirect_to calendar_path(@calendar), notice: 'Post was successfully created.' }
format.json { render :show, status: :created, location: @post }
else
format.html { render :new }
format.json { render json: @post.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /posts/1
# PATCH/PUT /posts/1.json
def update
respond_to do |format|
if @post.update(post_params)
format.html { redirect_to calendar_path, notice: 'Post was successfully updated.' }
format.json { render :show, status: :ok, location: @post }
else
format.html { render :edit }
format.json { render json: @post.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
@calendar = Calendar.find(params[:calendar_id])
@post.destroy
respond_to do |format|
format.html { redirect_to calendar_path(@calendar), notice: 'Post was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_post
@post = Post.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def post_params
params.require(:post).permit(:date, :time, :subject, :format, :copy, :media)
end
end
我一直在遇到类似的错误。
问题＃1：当我尝试从show.html.erb日历视图中删除一个帖子：
<h2><%= @calendar.name %> Calendar</h2>
<h3>Posts</h3>
<% if @calendar.posts.any? %>
<table>
<tr>
<th>Date</th>
<th>Time</th>
<th>Subject</th>
<th>Format</th>
<th>Copy</th>
<th>Media</th>
</tr>
<% @calendar.posts.each do |post| %>
<tr>
<td><%= post.date %></td>
<td><%= post.time %></td>
<td><%= post.subject %></td>
<td><%= post.format %></td>
<td><%= post.copy %></td>
<td><%= post.media %></td>
<td><%= link_to 'View', post %></td>
<td><%= link_to 'Update', edit_post_path(post) %></td>
<td><%= link_to 'Delete', post, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
</table>
<% end %>
...
我得到：
ActiveRecord::RecordNotFound in PostsController#destroy
Couldn't find Calendar with 'id'=
问题2： ：当我尝试更新edit.html.erb的帖子时后视图：
<h1>Editing Post</h1>
<%= render 'form' %>
<%= link_to 'Show', @post %> |
<%= link_to 'Back', posts_path %>
我得到：
ActiveRecord::RecordNotFound in PostsController#update
Couldn't find Calendar with 'id'=
问题＃3：当我回去从show.html.erb后视图show.html.erb日历视图：
<div>
<p>Date</p>
<%= @post.date %>
</div>
<div>
<p>Time</p>
<%= @post.time %>
</div>
<div>
<p>Subject</p>
<%= @post.subject %>
</div>
<div>
<p>Format</p>
<%= @post.format %>
</div>
<div>
<p>Copy</p>
<%= @post.copy %>
</div>
<div>
<p>Media</p>
<%= @post.media %>
</div>
<%= link_to 'Edit', edit_post_path(@post) %> |
<%= link_to 'Back', posts_path %>
我得到：
ActiveRecord::RecordNotFound in PostsController#show
Couldn't find Calendar with 'id'=
如果我错误的解释是正确的，每一次，这个问题似乎是，我不能检索calendar的post的id属于。
换句话说，我无法从子（后）控制器检索父（日历）ID。
我相信这是一个与我的嵌套浅层资源相关的问题，以及我的链接在视图中构建的方式。
我无法弄清楚如何使这些链接工作。
如果你能为我提供解决方案 - 最重要的是推理 - 对于上述三种情况之一，我绝对能够为其他两种解决方案提供解决方案。
有什么想法？