Rails 4嵌套资源/路由……差不多……？

我有三个模型 – 用户，制造商和生产线。 我需要用户拥有多个制造商，并且每个制造商都有多条生产线。 我终于将行最终拉到_form上的manufacturer_id，但现在它没有保存’line’的’name’，只保存id。 它会将’name’保存为nil，就像它没有从表单中传递名称一样。 我已经阅读了关于此的标准文档，我不能为我的生活让它工作。 它一直挂在控制器的最后创建阶段，我感觉我在窗体和控制器的路径上有很多错误。 希望有人能够轻松对待我并帮助我让整个shebang工作。

user.rb

class User < ActiveRecord::Base devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable has_many :manufacturers end 

manufacturer.rb

 class Manufacturer < ActiveRecord::Base belongs_to :user has_many :lines end 

line.rb

 class Line < ActiveRecord::Base belongs_to :manufacturer end lines_controller.rb class LinesController < ApplicationController before_action :set_line, only: [:show, :edit, :update, :destroy] before_filter :load_manufacturer # GET /lines # GET /lines.json def index @lines = Line.all end # GET /lines/1 # GET /lines/1.json def show end # GET /lines/new def new @manufacturer = Manufacturer.find(params[:manufacturer_id]) @line = @manufacturer.lines.build end # GET /lines/1/edit def edit end # POST /lines # POST /lines.json def create @line = @manufacturer.lines.build respond_to do |format| if @line.save format.html { redirect_to @line, notice: 'Line was successfully created.' } format.json { render action: 'show', status: :created, location: @line } else format.html { render action: 'new' } format.json { render json: @line.errors, status: :unprocessable_entity } end end end # PATCH/PUT /lines/1 # PATCH/PUT /lines/1.json def update respond_to do |format| if @line.update(line_params) format.html { redirect_to @line, notice: 'Line was successfully updated.' } format.json { head :no_content } else format.html { render action: 'edit' } format.json { render json: @line.errors, status: :unprocessable_entity } end end end # DELETE /lines/1 # DELETE /lines/1.json def destroy @line.destroy respond_to do |format| format.html { redirect_to lines_url } format.json { head :no_content } end end private # Use callbacks to share common setup or constraints between actions. def set_line @line = Line.find(params[:id]) end # Never trust parameters from the scary internet, only allow the white list through. def line_params params.require(:line).permit(:name, :manufacturer_id) end def load_manufacturer @manufacturer = Manufacturer.find(params[:manufacturer_id]) end end 

行/ _form.html.erb

   
 
 prohibited this line from being saved:
 
  
  
 
  
 
  
 
 
  
 
  
  

的routes.rb

 Linecarder::Application.routes.draw do resources :manufacturers do resources :lines end devise_for :users root "pages#home" get "about" => "pages#about" match 'users/:id' => 'users#show', :via => "get" match '/users', :to => 'users#index', :as => "all_users", :via => "get" match '/users/:name' => 'users#show', via: :get, as: :public_profile end 

耙路线

  Prefix Verb URI Pattern Controller#Action manufacturer_lines GET /manufacturers/:manufacturer_id/lines(.:format) lines#index POST /manufacturers/:manufacturer_id/lines(.:format) lines#create new_manufacturer_line GET /manufacturers/:manufacturer_id/lines/new(.:format) lines#new edit_manufacturer_line GET /manufacturers/:manufacturer_id/lines/:id/edit(.:format) lines#edit manufacturer_line GET /manufacturers/:manufacturer_id/lines/:id(.:format) lines#show PATCH /manufacturers/:manufacturer_id/lines/:id(.:format) lines#update PUT /manufacturers/:manufacturer_id/lines/:id(.:format) lines#update DELETE /manufacturers/:manufacturer_id/lines/:id(.:format) lines#destroy manufacturers GET /manufacturers(.:format) manufacturers#index POST /manufacturers(.:format) manufacturers#create new_manufacturer GET /manufacturers/new(.:format) manufacturers#new edit_manufacturer GET /manufacturers/:id/edit(.:format) manufacturers#edit manufacturer GET /manufacturers/:id(.:format) manufacturers#show PATCH /manufacturers/:id(.:format) manufacturers#update PUT /manufacturers/:id(.:format) manufacturers#update DELETE /manufacturers/:id(.:format) manufacturers#destroy new_user_session GET /users/sign_in(.:format) devise/sessions#new user_session POST /users/sign_in(.:format) devise/sessions#create destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy user_password POST /users/password(.:format) devise/passwords#create new_user_password GET /users/password/new(.:format) devise/passwords#new edit_user_password GET /users/password/edit(.:format) devise/passwords#edit PATCH /users/password(.:format) devise/passwords#update PUT /users/password(.:format) devise/passwords#update cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel user_registration POST /users(.:format) devise/registrations#create new_user_registration GET /users/sign_up(.:format) devise/registrations#new edit_user_registration GET /users/edit(.:format) devise/registrations#edit PATCH /users(.:format) devise/registrations#update PUT /users(.:format) devise/registrations#update DELETE /users(.:format) devise/registrations#destroy root GET / pages#home about GET /about(.:format) pages#about GET /users/:id(.:format) users#show all_users GET /users(.:format) users#index public_profile GET /users/:name(.:format) users#show 

Answer 1

更新create操作，如下所示：

  def create @line = @manufacturer.lines.build(line_params) ## Pass the params via line_params respond_to do |format| if @line.save format.html { redirect_to @line, notice: 'Line was successfully created.' } format.json { render action: 'show', status: :created, location: @line } else format.html { render action: 'new' } format.json { render json: @line.errors, status: :unprocessable_entity } end end end 

你没有传递你从表格中收到的参数。 因此，行的name不会保存在数据库中。 此外，为了允许质量分配（强参数）的属性通过line_params方法传递它们。

在评论中更新 OP的问题以解决undefined method 'line_url'... for 'format.html { redirect_to @line, notice: 'Line was successfully created.' }' undefined method 'line_url'... for 'format.html { redirect_to @line, notice: 'Line was successfully created.' }'

用这个

 format.html { redirect_to manufacturer_line_path(@manufacturer, @line), notice: 'Line was successfully created.' } 

代替

 format.html { redirect_to @line, notice: 'Line was successfully created.' }