Rails 5的多个嵌套属性，没有路由错误未初始化的常量站点

Question

你好，我有一个带有三个嵌套模型Client，Site和Damper的小应用程序。当我添加一个client或client_site时，一切都很好...但是当我添加一个阻尼器时，我得到

Routing Error
uninitialized constant Sites

在控制台中

Started GET "/clients/1/sites/1/dampers/new" for my ip at 2018-10-26 18:05:29 +1000

ActionController::RoutingError (uninitialized constant Sites):

app/controllers/clients/sites/dampers_controller.rb:1:in `<main>'

路线

resources :clients do
  resources :sites, controller: 'clients/sites' do
    resources :dampers, controller: 'clients/sites/dampers'
  end
end

模型

app / models / client.rb

class Client < ApplicationRecord
  has_many :sites
end

app / models / site.rb

class Site < ApplicationRecord
  belongs_to :client
  has_many :dampers
end

app / models / damper.rb

class Damper < ApplicationRecord
  belongs_to :site
end

请注意，我犯了一个错误，它原来是：sites，但是即使更改了此错误，仍然存在。

控制器

app / controllers / clients_controller.rb

class ClientsController < ApplicationController
  before_action :set_client, only: [:show, :edit, :update, :destroy]

  # GET /clients
  # GET /clients.json
  def index
    @clients = Client.all
  end

  # GET /clients/1
  # GET /clients/1.json
  def show
    @client = Client.find(params[:id])
    @sites = @client.sites
  end

  # GET /clients/new
  def new
    @client = Client.new
  end

  # GET /clients/1/edit
  def edit
  end

  # POST /clients
  # POST /clients.json
  def create
    @client = Client.new(client_params)

    respond_to do |format|
      if @client.save
        format.html { redirect_to @client, notice: 'Client was successfully created.' }
        format.json { render :show, status: :created, location: @client }
      else
        format.html { render :new }
        format.json { render json: @client.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /clients/1
  # PATCH/PUT /clients/1.json
  def update
    respond_to do |format|
      if @client.update(client_params)
        format.html { redirect_to @client, notice: 'Client was successfully updated.' }
        format.json { render :show, status: :ok, location: @client }
      else
        format.html { render :edit }
        format.json { render json: @client.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /clients/1
  # DELETE /clients/1.json
  def destroy
    @client.destroy
    respond_to do |format|
      format.html { redirect_to clients_url, notice: 'Client was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_client
      @client = Client.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def client_params
      params.require(:client).permit(:name)
    end
end

app / controllers / clients / sites_controller.rb

class Clients::SitesController < ApplicationController
  before_action :set_client
  before_action :set_site, except: [:new, :create]

  # GET /sites
  # GET /sites.json
  def index
    @sites = Site.all
  end

  # GET /sites/1
  # GET /sites/1.json
  def show
    @client = Client.find(params[:client_id])
    @site = @client.sites.find(params[:id])
  end

  # GET /sites/new
  def new
    @site = Site.new
  end

  # GET /sites/1/edit
  def edit
  end

  # POST /sites
  # POST /sites.json
  def create
    @site = Site.new(site_params)
    @site.client = @client

    respond_to do |format|
      if @site.save
        format.html { redirect_to @client, notice: 'Site was successfully created.' }
        format.json { render :show, status: :created, location: @client }
      else
        format.html { render :new }
        format.json { render json: @client.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /sites/1
  # PATCH/PUT /sites/1.json
  def update
    respond_to do |format|
      if @site.update(site_params)
        format.html { redirect_to @client, notice: 'Site was successfully updated.' }
        format.json { render :show, status: :ok, location: @site }
      else
        format.html { render :edit }
        format.json { render json: @client.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /sites/1
  # DELETE /sites/1.json
  def destroy
    @site.destroy
    respond_to do |format|
      format.html { redirect_to sites_url, notice: 'Site was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_site
      @site = Site.find(params[:id])
    end

  def set_client
    @client = Client.find(params[:client_id])
  end

    # Never trust parameters from the scary internet, only allow the white list through.
    def site_params
      params.require(:site).permit(:name, :client_id)
    end
end

app / controllers / clients / sites / dampers_controller.rb

class Sites::DampersController < ApplicationController
  before_action :set_client
  before_action :set_site
  before_action :set_damper, except: [:new, :create]

  # GET /dampers
  # GET /dampers.json
  def index
    @dampers = Damper.all
  end

  # GET /dampers/1
  # GET /dampers/1.json
  def show
  end

  # GET /dampers/new
  def new
    @damper = Damper.new
  end

  # GET /dampers/1/edit
  def edit
  end

  # POST /dampers
  # POST /dampers.json
  def create
    @damper = Damper.new(damper_params)
    @damper.site = @site

    respond_to do |format|
      if @damper.save
        format.html { redirect_to @site, notice: 'Damper was successfully created.' }
        format.json { render :show, status: :created, location: @site }
      else
        format.html { render :new }
        format.json { render json: @site.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /dampers/1
  # PATCH/PUT /dampers/1.json
  def update
    respond_to do |format|
      if @damper.update(damper_params)
        format.html { redirect_to @site, notice: 'Damper was successfully updated.' }
        format.json { render :show, status: :ok, location: @site }
      else
        format.html { render :edit }
        format.json { render json: @site.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /dampers/1
  # DELETE /dampers/1.json
  def destroy
    @damper.destroy
    respond_to do |format|
      format.html { redirect_to dampers_url, notice: 'Damper was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_damper
      @damper = Damper.find(params[:id])
    end
  def set_site
    @site = Site.find(params[:site_id])
  end
  def set_client
    @client = Client.find(params[:client_id])
  end

    # Never trust parameters from the scary internet, only allow the white list through.
    def damper_params
      params.require(:damper).permit(:location, :number, :site_id, :client_id)
    end
end

Answer 1

  

ActionController :: RoutingError（未初始化的常量网站）

div#firstDiv .second-div位于const $ = require('cheerio'); let str = '<div id="firstDiv">onjion<div class="second-div">efcee</div>ecc</div>' let selector = 'div#firstDiv .second-div'; let dom = $(selector,str); console.log(dom) 下，因此您需要将类名更改为

dampers_controller.rb

代替

controllers/clients/sites

为命名空间

此外，我建议您看看controller-namespaces-and-routing

Answer 2

您创建了一个名为Sites::DampersController的控制器，该控制器是在名为DampersController的命名空间（模块，类等）内定义的一个类Sites，但是您忘记了定义最后一个一个。

您可以通过以下方式创建它：

module Sites
  class DampersController < ApplicationController
  end
end

或者只是摆脱Sites::部分。

您还需要更新路由，以指定正确的控制器名称。

更一般而言，遵循Rails默认路线生成更容易：

resources :clients do
  resources :sites do
    resources :dampers
  end
end

将创建指向以下控制器的路由：

• ClientsController
• SitesController
• DampersController

如果您确实打算按照原始路由将其他控制器放在子文件夹中，则需要定义以下内容：

• 控制器ClientsController
• 模块Clients
模块SitesController中的
• 控制器Clients
模块Sites中的
• 模块Clients
模块DampersController中的
• 控制器Clients::Sites

对于要自动加载的作品，也必须在子文件夹中进行组织：

• 应用/控制器
  • clients_controllers.rb
  • 客户/
  • sites__controllers.rb
  • 网站/
    • dampers_controllers.rb