Question

我是Ruby on Rails noob。我在Ruby on Rails上通过Michael Hartl的tutorial工作。到目前为止，我在第3章关于静态页面。到目前为止，我的StaticPage控制器有三个视图：home，help和about。控制器的布局如下：

<!DOCTYPE html>
<html>
  <head>
    <title><%= yield(:title) %> | Sample App</title>
    <%= csrf_meta_tags %>

    <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
  </head>

  <body>
    <%= yield %>
  </body>
</html>

我现在要做的是添加菜单栏，即所有静态页面的链接列表。到目前为止，我在<body>标记处有类似内容：

<ul>
  <% '???'.each do |page| %>
    <li>Page!</li>
  <% end %>
</ul>

我无法弄清楚要放什么而不是'???' - 我需要一个控制器所有视图的迭代器。提前谢谢。

Answer 1

您要求的不仅仅是添加静态页面。您需要一个支持数据库model来存储动态创建的页面，并使用controller来处理model操作，这样您就可以生成collections。

使用collections，您就可以拥有类似

的内容

<ul>
  <% '???'.each do |page| %>
    <li><%= page %></li>
  <% end %>
</ul>

由于您正在使用该教程，因此您需要渲染您的菜单栏

<ul>
  <li><%= link_to "Home", home_path %></li>
  <li><%= link_to "Help", help_path %></li>
  <li><%= link_to "About", about_path %></li>
</ul>

Answer 2

You can render something from the database in the controller and use it in the views. Like in the controller, I can write @ones = Something.all in a method called one and if I have a show method in the controller who shows one record from the database depending on the argument it takes, then I can add a link as below and it will take me to something_show_path/:something_id.

<% @ones.each do |one|%>
    <%= link_to "#{one}", something_show_path(@one) %>
<% end %>

But in this case, there is no record of the static pages you have in the database. So, if you want a syntax like that in the views, add them in an array in the controller like

def whatever 
    ```rest of the code````
    @pages = ["home", "about", "help"]
end

And in the view, you can write

<ul>
    <% @pages.each do |p| %>
        <li><%= link_to("#{p}", :controller => 'static_page', :action => "#{p}") %></li>
    <% end %>
</ul>

Edit for the question in the comment

class StaticPagesController < ApplicationController

   before_filter :load_pages, :only => [:about, :home, :help]

   ``` All your controller codes ```
    private
    def load_pages 
        @pages = ["load", "about", "help"]
    end
 end

So that all the methods in the :only list will have @pages loaded before rendering the page. You don't have to load it in each method. you can declare the method in the ApplicationController by writing a private before it like I did it here and just call it in any controller with the before_filter.

迭代Ruby on Rails中的视图

2 个答案: