Following the example [guides.rubyonrails.org/getting\_started.html](http://guides.rubyonrails.org/getting_started.html) I receive an error *undefined method `articles' for nil:NilClass* in attempt of addition of article on the page.

routes.rb

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

```

views/articles/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

```

What am I doing wrong?