ActiveRecord::RecordNotFound在PermitsController#detail中，无法找到带有'id'=的许可

Question

嗨，伙计们，当我试图将许可证模型中的一个特定许可数据呈现给detail.html.erb时，我一直会遇到这个错误，我搜索了我所有的代码，却找不到bug。你们能帮我查一下我哪部分做错了吗？顺便说一下，我正在用rails实现一个网站

这是我的permits_controller.rb

class PermitsController < ApplicationController
  before_action :set_permit, only: [:destroy]
  def index
    @permits = Permit.where(:user_id => current_user.id)
  end

  def new
    @permits = Permit.new
  end

  def create
    @permits = current_user.permits.build(permit_params)
    if @permits.save
      redirect_to invoice_path
    else
      render 'new'
    end
  end


  def destroy
    Permit.destroy_all(user_id: current_user)
    respond_to do |format|
      format.html { redirect_to root_path, notice: 'Permit was successfully canceled.' }
      format.json { head :no_content }
    end
  end

  def confirm
    @fields = %i[vehicle_type, carplate, studentid, name, department, permitstart, permitend]
    @permit = current_user.permits.build(permit_params)
    render :new and return unless @permit.valid?
  end



  def show
    @permits = Permit.where(:user_id => current_user.id)
  end

  def update
    @permits = Permit.where(user_id: current_user).take
    respond_to do |format|
      if @permits.update(permit_params)
        format.html { redirect_to root_path}
        flash[:success] = "Permit successfully updated"
        format.json { render :show, status: :ok, location: @user }
      else
        format.html { render :edit }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  def edit
    @permits = Permit.find(params[:id])
    #@permits = Permit.find_or_initialize_by(user_id: params[:id])
  end
  def detail
    @permits = Permit.find(params[:id])
  end

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

  # Never trust parameters from the scary internet, only allow the white list through.
  def permit_params
    params.require(:permit).permit(:vehicle_type, :name, :studentid, :department, :carplate, :duration, :permitstart, :permitend)
  end
end

Detail.html.erb

<% provide(:title, 'New Permit') %>
<h1>Permit Application</h1>

<div class="row">
  <div class="col-md-6 col-md-offset-3">


        <h2><%= @permits.permitstart %></h2>

  </div>
</div>

Route.db

Rails.application.routes.draw do
  resources :users
  resources :permits do
    collection do
      post :confirm
    end
  end
  resources :visitor_permits
  root 'static_pages#home'

  get 'viewpermit' =>'permits#detail'

  get 'invoice' => 'permits#invoice'
  get 'payment' =>'transaction#new'
  get 'show_visitor_permit' =>'visitor_permits#show'
  get 'show_permit' =>'permits#show'
  get 'visitorpermit' => 'visitor_permits#new'
  post 'createpermit' => 'permits#create'
  get 'homepage/index'
  post 'permits' => 'permits#create'
  get 'permitapplication' => 'permits#new'
  get 'adminlogin' => 'admin_controller#index'
  get 'patrollogin' => 'patrol_officer_controller#index'
  get 'createcitation' => 'citations#new'
  get 'contact'=> 'static_pages#contact'
  get 'about' => 'static_pages#about'
  get 'signup' => 'users#new'
  get 'help' => 'static_pages#help'
  post 'users' => 'users#create'
  get 'login' => 'sessions#new' #Page for a new session
  post 'login' => 'sessions#create' #Create a new session
  delete 'logout'=>'sessions#destroy' #Delete a session


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

这是我的链接页(show.html.erb)

<h2>My Permits</h2>
<table>
  <tr>
    <th>Permit Start Date</th>
    <th>Permit End Data</th>
    <th>Action</th>
    <th> </th>
  </tr>
<% @permits.each do |permit| %>

  <tr>
    <td><%= permit.permitstart %></td>
    <td><%= permit.permitend %></td>
    <td><%= link_to 'Detail', viewpermit_path(permit) %></td>
    <td><%= link_to 'Edit', edit_permit_path(permit) %></td>
  </tr>

<% end %>

</table>

Answer 1

你还没有用适当的方式来定义你的路线。您的路由只是重定向到操作#detail，但没有在路由中设置变量。你有多种选择

resources :permits do
  collection do
    post :confirm
  end

  member do
    get 'viewpermit' # enables a route like /permits/1/viewpermit
  end
end

# or

get 'viewpermit/:id' => 'permits#detail' #enables route /viewpermit/1

Answer 2

编辑：

在您的show action.replace where to find

def show
  @permits = Permit.find(params[:id])
end