M Hartl 的 Ruby on Rails 教程第 5 章主页上的自定义标题 [英] M Hartl's Ruby on Rails Tutorial Chapter 5 custom title on home page

问题描述

在 Michael Hartl 的 RoR 教程中:第 5 章末尾的练习涉及简化 RSpec 测试.

In Michael Hartl's RoR tutorial: the exercises at the end of chapter 5 involve simplifying RSpec tests.

5.37 ( http://ruby.railstutorial.org/Chapters/filling-in-the-layout#sec-layout_exercises ) 为主页定义了几个测试.在文件 spec/helpers/application_helper_spec.rb 中:

5.37 ( http://ruby.railstutorial.org/chapters/filling-in-the-layout#sec-layout_exercises ) defines several test for the home page. In the file spec/helpers/application_helper_spec.rb:

require 'spec_helper'

describe ApplicationHelper do

  describe "full_title" do
  .
  .
  .
  .
    it "should not include a bar for the home page" do
      full_title("").should_not =~ /\|/
    end
  end
end

要通过此测试，我需要显示主页标题:Ruby on Rails 教程示例应用程序"而不是Ruby on Rails 教程示例应用程序 | 主页"

For this test to pass, I need to have the Home page title display: "Ruby on Rails Tutorial Sample App" And not "Ruby on Rails Tutorial Sample App | Home"

但是，本教程并未引导我了解如何编写更改代码.

But, the tutorial doesn't walk me through how to code that change.

这是我尝试过的:

在 app/views/static_pages/home.html.erb 中:

In app/views/static_pages/home.html.erb:

1. 删除:

<% provide(:title, 'Home') %>

在 app/views/layouts/application.html.erb将标签编辑为:

In app/views/layouts/application.html.erb Edit the tag to:

<title>
 <% if :title
  full_title = "Ruby on Rails Tutorial Sample App | " && yield(:title)
 else
  full_title = "Ruby on Rails Tutorial Sample App"
 end %>
 <%= print full_title %>
</title>

以及我的菜鸟大脑可以召集的其他变化.这是我想要完成的:

And other variations my noob brain could muster. Here's what I'm trying to accomplish:

如果页面没有提供标题，返回Ruby on Rails Tutorial Sample App"

If the page has no title provided, return "Ruby on Rails Tutorial Sample App"

如果提供了标题，则返回Ruby on Rails 教程示例应用 | #PageTitle"

If there is a title provided, return "Ruby on Rails Tutorial Sample App | #PageTitle"

感谢任何建议.

推荐答案

这个怎么样?

module ApplicationHelper

  # Returns the full title on a per-page basis.
  def full_title(page_title)
    base_title = "Ruby on Rails Tutorial Sample App"
    if page_title.empty?
      base_title
    else
      "#{base_title} | #{page_title}"
    end
  end
end

http://ruby.railstutorial.org/chapters/rails-风味红宝石#code-title_helper

只需调用视图中的方法即可.所以它应该是这样的正如他所说.

Just call the method inside your view. So it should be something like <title><%= full_title(yield(:title)) %></title> as he says.

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