我有一个父/子关系模型，设置了嵌套资源，以便在其显示页面的某个父级下创建子数据。但是，当我从父页面（“http://localhost:3000/brands/1/restaurants/new”）单击子项的新页面链接时，我收到一条错误，指出“NoMethodError in ...”。请帮忙。
配置/ routes.rb中
Rails.application.routes.draw do
resources :brands, shallow: true do
resources :restaurants
end
resources :managers
# Prefix Verb URI Pattern Controller#Action
# brand_restaurants GET /brands/:brand_id/restaurants(.:format) restaurants#index
# POST /brands/:brand_id/restaurants(.:format) restaurants#create
# new_brand_restaurant GET /brands/:brand_id/restaurants/new(.:format) restaurants#new
# edit_restaurant GET /restaurants/:id/edit(.:format) restaurants#edit
# restaurant GET /restaurants/:id(.:format) restaurants#show
# PATCH /restaurants/:id(.:format) restaurants#update
# PUT /restaurants/:id(.:format) restaurants#update
# DELETE /restaurants/:id(.:format) restaurants#destroy
# brands GET /brands(.:format) brands#index
# POST /brands(.:format) brands#create
# new_brand GET /brands/new(.:format) brands#new
# edit_brand GET /brands/:id/edit(.:format) brands#edit
# brand GET /brands/:id(.:format) brands#show
# PATCH /brands/:id(.:format) brands#update
# PUT /brands/:id(.:format) brands#update
# DELETE /brands/:id(.:format) brands#destroy
# managers GET /managers(.:format) managers#index
# POST /managers(.:format) managers#create
# new_manager GET /managers/new(.:format) managers#new
# edit_manager GET /managers/:id/edit(.:format) managers#edit
# manager GET /managers/:id(.:format) managers#show
# PATCH /managers/:id(.:format) managers#update
# PUT /managers/:id(.:format) managers#update
# DELETE /managers/:id(.:format) managers#destroy managers#destroy
end
模型/ brand.rb
class Brand < ActiveRecord::Base
has_many :restaurants
end
模型/ restaurants.rb
class Restaurant < ActiveRecord::Base
belongs_to :brand
end
控制器/ restaurants_controller.rb
class RestaurantsController < ApplicationController
before_action :set_restaurant, only: [:new, :create, :show, :edit, :update, :destroy]
# GET /restaurants
# GET /restaurants.json
def index
@restaurants = Restaurant.all
end
# GET /restaurants/1
# GET /restaurants/1.json
def show
end
# GET /restaurants/new
def new
# @restaurant = Restaurant.new
@restaurant = Restaurant.new
end
# GET /restaurants/1/edit
def edit
end
# POST /restaurants
# POST /restaurants.json
def create
@restaurant = Restaurant.new(restaurant_params)
respond_to do |format|
if @restaurant.save
format.html { redirect_to brands_path, notice: 'Restaurant was successfully created.' }
format.json { render :show, status: :created, location: @restaurant }
else
format.html { render :new }
format.json { render json: @restaurant.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /restaurants/1
# PATCH/PUT /restaurants/1.json
def update
respond_to do |format|
if @restaurant.update(restaurant_params)
format.html { redirect_to @restaurant, notice: 'Restaurant was successfully updated.' }
format.json { render :show, status: :ok, location: @restaurant }
else
format.html { render :edit }
format.json { render json: @restaurant.errors, status: :unprocessable_entity }
end
end
end
# DELETE /restaurants/1
# DELETE /restaurants/1.json
def destroy
@restaurant.destroy
respond_to do |format|
format.html { redirect_to restaurants_url, notice: 'Restaurant was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_restaurant
@restaurant = Restaurant.find_by(params[:brand_id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def restaurant_params
params.require(:restaurant).permit(:name, :brand_id) if params[:restaurant]
end
end
视图/品牌/ show.html
<p id="notice"><%= notice %></p>
<p>
<strong>Name:</strong>
<%= @brand.name %>
</p>
<p>
<strong>Manager:</strong>
<%= @brand.manager_id %>
</p>
<table>
<% @brand.restaurants.each do |restaurant| %>
<tr>
<td><%= restaurant.name %></td>
<td><%= restaurant.brand_id %></td>
<td><%= link_to 'Show', restaurant %></td>
<td><%= link_to 'Edit', edit_restaurant_path(restaurant) %></td>
<td><%= link_to 'Destroy', restaurant, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
</table>
<br>
**<%= link_to 'Add New Restaurant', new_brand_restaurant_path(@brand) %>**
<%= link_to 'Edit', edit_brand_path(@brand) %> |
<%= link_to 'Back', brands_path %>
我做错了什么？ 感谢您的帮助。
添加完整错误消息：
餐馆中的NoMethodError #new Showing /Users/kaku/sample/relation/app/views/restaurants/_form.html.erb在哪里 第1行提出：
的未定义方法`restaurants_path'
＆LT;＃：0x007fd4ec2e46e0＆GT;提取的来源（第1行附近）：1 2 3 4 5 6
<%= form_for(@restaurant) do |f| %>＆lt;％if @ restaurant.errors.any？ ％GT;
＆lt;％= pluralize（@ restaurant.errors.count，“error”）％＆gt;禁止这家餐馆被保存：
模板包含跟踪：app / views / restaurants / new.html.erb
Rails.root：/ Users / kaku / sample / relation
应用程序跟踪|框架跟踪|完整追踪 应用程序/视图/餐厅/ _form.html.erb：1：
_app_views_restaurants__form_html_erb__1732550980462972679_70276222510780' app/views/restaurants/new.html.erb:3:in_ app_views_restaurants_new_html_erb___209183791776779444_70276222559000' 请求参数：
{“brand_id”=＆gt;“2”}切换会话转储 _csrf_token：“MG3xNH + mscxxPiQqLVkF011BDb5RGlWJPuTN3GiEcGo =”session_id：“e1f92f37d231a058162af62bae976ff5”切换env转储 GATEWAY_INTERFACE：“CGI / 1.1”HTTP_ACCEPT： “text / html的，应用/ XHTML + xml的，应用/ XML; Q = 0.9，图像/ WEBP， / 的; Q = 0.8” HTTP_ACCEPT_ENCODING：“gzip，deflate，sdch”HTTP_ACCEPT_LANGUAGE： “ja，en-US; q = 0.8，en; q = 0.6”REMOTE_ADDR：“:: 1”REMOTE_HOST：“:: 1” SERVER_NAME：“localhost”SERVER_PROTOCOL：“HTTP / 1.1”响应
接头：
无
答案 0 :(得分：0)
正如您在代码中指出的那样，我认为错误就在这一行
<%= link_to 'Add New Restaurant', new_brand_restaurant_path(@brand) %>
@brand
new方法中应该有restaurants_controller
def new
@brand = Brand.find(params[:brand_id])
@restaurant = Restaurant.new
end
而且我注意到你错误地定义了set_restaurant。它应该是
def set_restaurant
@restaurant = Restaurant.find(params[:id])
end
<强> 更新
未定义的方法`restaurants_path＆＃39;
你有嵌套资源，所以这一行
<%= form_for(@restaurant) do |f| %>
应该是
<%= form_for [@brand, @restaurant] do |f| %>