Question

所以我试图学习如何创建一个简单的Ruby on Rails应用程序。我正在创建一个用户可以输入数据的字段。在提交（或创建）时，将保存此数据，然后用户返回主页。所以我有localhost：3000 / listings / new来创建模型，然后我尝试访问localhost：3000 / listings / 1来查看新创建的模型，并遇到Record Not Found错误。我不确定为什么会这样，我已经找了几个小时没有结果。

listings_controller.rb

class ListingsController < ApplicationController

  def new
    @listing = Listing.new #calls on new method in listing model
  end

  def create
     @listing = Listing.new(listing_params)
     @listing.save
     redirect_to root_path
  end

  def show
    @listing = Listing.find(params[:id])
  end

  private
  def listing_params
    params.require(:listing).permit(:title, :description, :city, :state, :zipcode)
  end

end

new.html.erb和show.html.erb（如果需要）

<div class="topbar">

</div>
<div class="container">
  <div id="contact-area">

    <%= form_for @listing do |f| %>
    <!-- taken from schema.rb -->
    <%= f.label :title %>
    <%= f.text_field :title %> <!-- use text field when body is just 1 line -->

    <%= f.label :description %>
    <%= f.text_area :description %> <!-- more for paragraphs -->

    <%= f.label :city %>
    <%= f.text_field :city %>

    <%= f.label :state %>
    <%= f.text_field :state %>

    <%= f.label :zipcode %>
    <%= f.text_field :zipcode, class: "zip-width", maxlength: "5" %>

    <%= f.submit class: "create-button"%>

    <% end %>
  </div>
 </div>

和

<div class="topbar">
  <div class="container">
    <div class="vertical-center">
      <%= link_to 'home', root_path %> > jobs > accounting
    </div>
  </div>
 </div>
<div class="container">
  <div>
     <button type="button">reply</button>
     posted <%= time_ago_in_words(@listing.created_at) %>
    <h1 class="listing-header"><%= @listing.title %></h1>
    <div class="box">
      <p>test</p>
    </div>
    <p><%= @listing.description%></p>
   </div>
  <footer>
    <p>post id: <%= @listing.id%></p>
    <p>posted <%= time_ago_in_words(@listing.created_at) %></p>
  </footer>
</div>

的routes.rb

Rails.application.routes.draw do
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html

  #NOTE USE rake routes TO SEE ALL ROUTES

  #Creates the CRUD actions for categories
  resources :categories do
  resources :subcategories #Creates CRUD actions for subcategories
  end

  resources :listings

  root 'categories#index' #first page that we land on -- homepage

  #matching paths to pages controller
  match '/help', to: 'pages#help', via: :get
  match '/scams', to: 'pages#scams', via: :get
  match '/safety', to: 'pages#safety', via: :get
  match '/terms', to: 'pages#terms', via: :get
  match '/privacy', to: 'pages#privacy', via: :get
  match '/about', to: 'pages#about', via: :get
  match '/contact', to: 'pages#contact', via: :get
end

Answer 1

当您尝试创建列表时，可能会遇到某种类型的验证错误，并且正在回滚创建。要查看有关此内容的信息性错误，请通过替换以下内容更新您的创建操作：

@listing.save

带

@listing.save!

前者（你拥有的）以静默方式失败，只为无效记录返回false。后者（随着爆炸）失败，无效记录例外。

Answer 2

将其作为

  def create
     @listing = Listing.new(listing_params)
     if @listing.save
       flash[:notice] = "Listing created successfully."
       redirect_to listing_path(@listing)
     else
       flash[:error] = @listing.errors.full_messages
       render 'new'
     end
  end

并检查闪存中的错误消息

Rails Webapp中记录未找到错误

2 个答案: