Simple_form 嵌套资源：未定义的方法

问题描述

我是 RoR 的新手，我在使用带有嵌套资源的 simple_form 时遇到了问题。

我有两个模型：面试和练习。面试有_许多实践和实践属于_面试。

我在尝试使用 simple_form 在interview_id 中创建新实践时遇到Action Controller 错误（未定义方法`practices_path' for #）。在这条路线上：/interviews/:interview_id/practices/new)

谁能帮助确定我做错了什么？在此先感谢您。

控制器

class PracticesController < ApplicationController
  def index
    @practices = Practice.all
  end

  def new
    @practice = Practice.new
  end

  def create
    @interview = Interview.find(params[:interview_id])
    @practice = Practice.new(practice_params)
    @practice.interview = @interview
    if @practice.save
      redirect_to new_interview_practice_path(@interview)
    else
      render 'new'
    end
  end

  # def destroy
  #   @interview = Interview.find(params[:id])
  #   @question.interview = @interview
  #   @question.destroy
  #   redirect_to interview_questions_path(@interview)

  private

  def practice_params
    params.require(:practice).permit(:question,:type,:title)
  end
end

class InterviewsController < ApplicationController

  def index
    @interviews = Interview.all
  end

  def new
    @interview = Interview.new
  end

  def create
    @interview = Interview.new(interview_params)
    @interview.user = current_user
    if @interview.save
      redirect_to interview_path(@interview)
    end
  end

  def show
    @interview = Interview.find(params[:id])
    @question = Question.new
  end

  def destroy
    @interview = Interview.find(params[:id])
    @interview.destroy
    redirect_to interviews_path
  end

private

  def interview_params
    params.require(:interview).permit(:company,:industry,:photo)
  end
end

模型

class Interview < ApplicationRecord
  belongs_to :user
  has_many :videos,dependent: :destroy
  has_many :questions,dependent: :destroy
  has_many :practices,dependent: :destroy
  validates :company,presence: true
  has_one_attached :photo

  def days_remaining
    -(Date.today - self.final_date.to_date).to_i if self.final_date
  end

  include PgSearch::Model
  pg_search_scope :search_by_name_and_date,against: [:name,:open_date,:final_date,:company],using: {
      tsearch: { prefix: true }
    }
end

class Practice < ApplicationRecord
  belongs_to :interview
  has_many :questions,through: :interviews
end

查看

<br>
<div class="text-center">
  <h3>Lets create a new practice interview!</h3>
</div>
<div class="form-container">
  <%= simple_form_for [@interview,@practice] do |f| %>
  <div class="flex-container2">
    <div class="form-style-5">
      <legend><span class="number">1</span> Job Info</legend>
      <%= f.input :title,placeholder: "give it a name"%>
      <%= f.input :type,placeholder: "Competency"%>
      <%= f.input :question,placeholder: "add here" %>
    </div>

  </div>
  <div class="row d-flex justify-content-center mb-5">
    <div class="col-md-7">
      <%= f.submit class: "btn btn-primary"%>
    </div>
  </div>
  <% end %>
</div>

路线

Rails.application.routes.draw do
  devise_for :users
  root to: 'pages#home'
  get 'dashboard',to: 'users#dashboard'
  get 'calendar',to: 'pages#calendar'
  get 'video',to: 'pages#video'
  get 'settings',to: 'pages#settings'
  post 'sendsms',to: 'videos#send_sms'

  resources :interviews,only: [:index,:new,:create,:show,:destroy] do
    resources :questions,:show]
    resources :practices,:destroy]
    resources :videos,:show] do
      resources :reviews,only: [:new,:create]
    end
  end
  resources :candidates,only: [:create,:show]
  resources :searches

  get 'thank_you',to: 'videos#thank_you'

  # For details on the DSL available within this file,see https://guides.rubyonrails.org/routing.html
end

架构

  create_table "interviews",force: :cascade do |t|
    t.datetime "open_date"
    t.datetime "final_date"
    t.bigint "user_id",null: false
    t.datetime "created_at",precision: 6,null: false
    t.datetime "updated_at",null: false
    t.string "name"
    t.string "company"
    t.string "industry"
    t.index ["user_id"],name: "index_interviews_on_user_id"
  end

  create_table "practices",force: :cascade do |t|
    t.string "title"
    t.string "type"
    t.text "question"
    t.bigint "interview_id",null: false
    t.index ["interview_id"],name: "index_practices_on_interview_id"
  end

解决方法

奇怪的

Action Controller error (undefined method `practices_path' for #<#Class:0x00007fda24ed79d8:0x00007fda24ed5fe8>)

error 只是意味着 Rails 正在尝试获取 [@interview,@practice] 的路径（您在视图中使用的）但 @interview 为空或 nil，因此创建记录的默认路径（在这种情况下） @practice) 将是 practices_path（表单将是 /practices 的帖子）。

您想要的是 simple_form_for 使用 interviews_practices_path 将转换为 /interviews/:interview_id/practices。

在您的 PracticesController 操作 new 中，您还需要初始化一个新的 @interview 变量，因为您正在视图中使用它。

由于您的练习模型是嵌套的，这意味着当您转到 /interviews/:interview_id/practices/new 时，您的 ID 将来自 URL，并且在 params[:interview_id] 中可用。

因此，一个简单的解决方案是添加：

def new
  @interview = Interview.find(params[:interview_id]
  @practice = Practice.new
end