Rails 入门教程 5.7:未正确创建文章对象 [英] Getting Started with Rails Tutorial 5.7: Article object is not being created correctly

问题描述

导轨:4.1.2红宝石:2.1.2

Rails: 4.1.2 Ruby: 2.1.2

我正在尝试完成入门教程 (http://guides.rubyonrails.org/getting_started.html)，但在第 5.7 节中遇到问题.当我的标题和文本都应该正确显示时，我得到一个未知属性:标题".我怀疑是文章对象没有被正确创建或保存，但我一直没能找到错误.

I'm trying to complete the Getting Started tutorial (http://guides.rubyonrails.org/getting_started.html) but am having trouble with section 5.7. At the point when my Title and Text should both be displaying correctly, I am getting an "unknown attribute: title". My suspicion is that the article object is not being created or saved correctly, but I haven't been able to find the bug.

这是我的articles_controller.rb:

Here is my articles_controller.rb:

class ArticlesController < ApplicationController
  def new
  end

  def create
    # render plain: params[:article].inspect
    @article = Article.new(article_params)

    @article.save
    redirect_to @article
  end

  def show
    @article = Article.find(params[:id])
  end


  def article_params
    params.require(:article).permit(:title, :text)
  end

  private :article_params
end

我的 show.html.erb:

My show.html.erb:

<p>
  <strong>Title:</strong>
  <%= @article.title %>
</p>

<p>
  <strong>Text:</strong>
  <%= @article.text %>
</p>

还有我的佣金路线:

       Prefix Verb   URI Pattern                  Controller#Action
     articles GET    /articles(.:format)          articles#index
              POST   /articles(.:format)          articles#create
  new_article GET    /articles/new(.:format)      articles#new
 edit_article GET    /articles/:id/edit(.:format) articles#edit
      article GET    /articles/:id(.:format)      articles#show
              PATCH  /articles/:id(.:format)      articles#update
              PUT    /articles/:id(.:format)      articles#update
              DELETE /articles/:id(.:format)      articles#destroy
welcome_index GET    /welcome/index(.:format)     welcome#index
         root GET    /                            welcome#index

还有一些可能令人感兴趣的是错误页面报告的参数，它们看起来不像我预期的那样，但我知道什么?

Also something that may be of interest are the parameters as reported by the error page, they didn't look as I would have expected, but what do I know?

参数:

{"utf8"=>"✓",
 "authenticity_token"=>"OFbPxhf...2V+e9zu3A=",
 "article"=>{"title"=>"sdf",
 "text"=>"sadfdf"},
 "commit"=>"Save Article"}

有人可以对此有所了解吗?谢谢！！

Can anyone shed any light on this? Thanks!!

推荐答案

基于此，从您的评论中，#

"问题是当你创建你的文章模型时，你没有添加标题和文本列.试试这个:

Based on this, from your comment, #<Article id: nil, created_at: nil, updated_at: nil>" the problem is that when you created your Article model, you didn't add the title and text columns. Try this:

rails g migration add_title_to_articles title:string text:text
rake db:migrate

这应该为您的文章模型添加一个标题属性，您应该很高兴.

That should add a title attribute to your articles model and you should be good to go.

阅读指南的第 5.4 节后，我怀疑您忘记了 generate model 命令的一小部分，并且遗漏了这些字段.而不是这样:

After reading section 5.4 of the guide, I suspect that you forgot a little part of the generate model command and are missing those fields. Instead of this:

rails generate model Article title:string text:text

您可能已经这样做了:

rails generate model Article

这将只生成一个:id、:created_at 和 :updated_at

This would have generated just an :id, :created_at, and :updated_at

http://guides.rubyonrails.org/getting_started.html#创建文章模型

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