每天一剂Rails良药之Syndicate Your Site With RSS
今天来看看Rails对RSS的支持:
feed_controller.rb:
因为RSS请求是无状态的，所以session \:off可以提高性能
recipes.rxml:
这样生成的RSS feed的例子为:
另外我们可以在网站首页的<head>标签里加上以下内容以便于RSS订阅工具自动找到本网站的RSS:
这段代码将为我们生成<link>标签，如:
BTW:蛙眼把文章中的“: o”用笑脸图片来替换，真是很弱智好不好。
feed_controller.rb:
class FeedController < ApplicationController
session \:off
def recipes
@recipes = Recipe.find(:all,
\:order => "updated_at, created_at",
:limit => 15)
@headers["Content-Type"] = "application/rss+xml"
end
end
因为RSS请求是无状态的，所以session \:off可以提高性能
recipes.rxml:
xml.instruct!
xml.rss "version" => "2.0"
"xmlns:dc" => "http://purl.org/dc/elements/1.1/" do
xml.channel do
xml.title 'Recipes on Rails'
xml.link url_for(\:only_path => false,
:controller => 'recipes',
:action => 'list')
xml.pubDate CGI.rfc1123_date(@recipes.first.updated_at)
xml.description h("Recipes created for and by guys who shouldn't be cooking.")
@recipes.each do |recipe|
xml.item do
xml.title recipe.title
xml.link url_for(\:only_path => false,
:controller => 'recipes',
:id => recipe)
xml.description h(recipe.instructions.to_s)
xml.pubDate CGI.rfc1123_date(recipe.updated_at)
xml.guid url_for(\:only_path => false,
:controller => 'recipes',
:action => 'show',
:id => recipe)
xml.author h(recipe.author.name)
end
end
end
end
这样生成的RSS feed的例子为:
<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">
<channel>
<title>Recipes on Rails</title>
<link>http://myserver:2007/recipes/list</link>
<pubDate>Fri, 03 Mar 2007 04:53:50 GMT</pubDate>
<description>
Recipes created for and by guys who shouldn't be cooking.
</description>
<item>
<title>Canned Fish and Chips</title>
<link>http://myserver:2007/recipes/show/6</link>
<description>
1. Open can. 2. Empty contents into bowl. 3. Serve.
</description>
<pubDate>Fri, 03 Mar 2007 04:58:42 GMT</pubDate>
<guid>http://:2003/recipes/show/6</guid>
<author>David</author>
</item>
</channel>
</rss>
另外我们可以在网站首页的<head>标签里加上以下内容以便于RSS订阅工具自动找到本网站的RSS:
<%= auto_discovery_link_tag(:rss,
{:controller => 'feed', :action => 'recipes'}) %>
这段代码将为我们生成<link>标签，如:
<link href="http://www.chadfowler.com/index.cgi?rss"
rel="alternate"
title="RSS"
type="application/rss+xml" />
BTW:蛙眼把文章中的“: o”用笑脸图片来替换，真是很弱智好不好。