Question

在示例guides.rubyonrails.org/getting_started.html之后，我收到了一个错误未定义的方法`articles'for nil：NilClass ，试图在页面上添加文章。

的routes.rb

Rails.application.routes.draw do
  root :to => redirect('/pages/1')
  resources :articles
  resources :pages do
    resources :articles
  end

视图/物品/ new.html.erb

<h1>New Article</h1>
<%= form_for([@page, @page.articles.build]) do |f| %>
  <p>
    <%= f.label :item %><br>
    <%= f.text_field :item %>
  </p>
  <p>
    <%= f.label :description %><br>
    <%= f.text_area :description %>
  </p>
  <p>
    <%= f.submit %>
  </p>
<% end %>

articles_controller.rb

class ArticlesController < ApplicationController
  def new
    @article = Article.new
  end

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

  def create
    @page = Page.find(params[:page_id])
    @article = @page.articles.create(article_params)
    redirect_to root_path if @article.save
  end

  private
    def article_params
      params.require(:article).permit(:item, :description)
    end
end

我做错了什么？

Answer 1

您未在new行动中定义create。您需要在new行动中添加类似于edit所做的内容（也可能是<script type="text/javascript"> function myfunction() { var firstfield = document.getElementById('firstfield').value; ...repeated.. for 7 more fields... /* Base 64 Encode the username and password */ var UserPassword64Encoded = User + ":" + Password; var UserPassword64Encoded = btoa(UserPassword64Encoded); /* here is where I assemble the URL */ document.getElementById('results').innerHTML = firstfield + "?some_static_info=" + ... repeated 7 more times...; document.getElementById('results').style.display = "block"; return false; } </script>行动）。

Answer 2

before_action :load_page

...

protected
def load_page
  @page ||= Page.find(params[:page_id])
end

在页面上添加文章时出错

2 个答案: