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# RSS Feed
## Introduction
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Generating RSS/Atom-feeds is a matter of rendering a `[api:SS_List]` through
the `[api:RSSFeed]` class.
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The `[api:RSSFeed]` class doesn't limit you to generating article based feeds,
it is just as easy to create a feed of your current staff members, comments or
any other custom `[api:DataObject]` subclasses you have defined. The only
logical limitation here is that every item in the RSS-feed should be accessible
through a URL on your website, so its advisable to just create feeds from sub
classes of `[api:SiteTree]` .
If you wish to generate an RSS feed for `[api:DataObject]` instances, ensure they
define an AbsoluteLink() method.
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## Usage
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:::php
RSSFeed::linkToFeed($link, $title)
This line should go in your `[api:Controller]` subclass in the action you want
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to include the HTML link. Not all arguments are required, see `[api:RSSFeed]` and example below. Last Modified Time is expected in seconds like time().
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:::php
$feed = new RSSFeed(
$list,
$link,
$title,
$description,
$titleField,
$descriptionField,
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$authorField,
$lastModifiedTime,
$etag
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);
Creates a new `[api:RSSFeed]` instance to be returned. The arguments notify
SilverStripe what values to include in the feed.
## Examples
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### Showing latest blog posts
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:::php
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class Page_Controller extends ContentController {
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private static $allowed_actions = array('rss');
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public function init() {
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// linkToFeed will add an appropriate HTML link tag to the website
// < head > tag to notify web browsers that an RSS feed is available
// for this page. You can include as many feeds on the page as you
// wish as long as each as a different link. For example:
// ('blog/rss', 'staff/rss').
//
// In this example $this->Link("rss") refers to the *rss* function
// we define below.
RSSFeed::linkToFeed($this->Link("rss"), "RSS feed of this blog");
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parent::init();
}
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public function rss() {
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// Creates a new RSS Feed list
$rss = new RSSFeed(
$list = $this->getBlogPosts(), // an SS_List containing your feed items
$link = $this->Link("rss"), // a HTTP link to this feed
$title = "My feed", // title for this feed, displayed in RSS readers
$description = "This is an example feed." // description
);
// Outputs the RSS feed to the user.
return $rss->outputToBrowser();
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}
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public function getBlogPosts() {
return BlogPage::get()->limit(10);
}
}
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### Showing the 10 most recently updated pages
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You can use `[api:RSSFeed]` to easily create a feed showing your latest Page
updates. Update mysite/code/Page.php to something like this:
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:::php
< ?php
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class Page extends SiteTree {}
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class Page_Controller extends ContentController {
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private static $allowed_actions = array('rss');
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public function init() {
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RSSFeed::linkToFeed($this->Link() . "rss", "10 Most Recently Updated Pages");
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parent::init();
}
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public function rss() {
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$rss = new RSSFeed($this->LatestUpdates(), $this->Link(), "10 Most Recently Updated Pages", "Shows a list of the 10 most recently updated pages.");
return $rss->outputToBrowser();
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}
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public function LatestUpdates() {
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return Page::get()->sort("LastEdited", "DESC")->limit(10);
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}
}
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### Rendering DataObjects in a RSSFeed
DataObjects can be rendered in the feed as well, however, since they aren't explicitly
`[api:SiteTree]` subclasses we need to include a function `AbsoluteLink` to allow the
RSS feed to link through to the item.
If the items are all displayed on a single page you may simply hard code the link to
point to a particular page.
Take an example, we want to create an RSS feed of all the Students, a DataObject we
defined in the [fifth tutorial ](/tutorials/5-dataobject-relationship-management ).
:::php
< ?php
class Student extends DataObject {
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public function AbsoluteLink() {
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// see tutorial 5, students are assigned a project, so the 'link'
// to view the student is based on their projects link.
return $this->Project()->AbsoluteLink();
}
}
Then update the Page_Controller class in mysite/code/Page.php to include an RSSFeed
for all the students as we've seen before.
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:::php
class Page_Controller extends ContentController {
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private static $allowed_actions = array('students');
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public function init() {
RSSFeed::linkToFeed($this->Link("students"), "Students feed");
parent::init();
}
public function students() {
$rss = new RSSFeed(
$list = $this->getStudents(),
$link = $this->Link("students"),
$title = "Students feed"
);
return $rss->outputToBrowser();
}
public function getStudents() {
return Student::get()->sort("Created", "DESC")->limit(10);
}
}
### Customizing the RSS Feed template
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The default template used is framework/templates/RSSFeed.ss and includes
displaying titles and links to the content. If you have a particular need
for customizing the XML produced (say for additional meta data) use `setTemplate` .
Taking that last example, we would rewrite the students function to include a
unique template (write your own XML in themes/yourtheme/templates/Students.ss)
:::php
public function students() {
$rss = new RSSFeed(
$list = $this->getStudents(),
$link = $this->Link("students"),
$title = "Students feed"
);
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$rss->setTemplate('Students');
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return $rss->outputToBrowser();
}
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## External Sources
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`[api:RSSFeed]` only creates feeds from your own data. We've included the [SimplePie ](http://simplepie.org ) RSS-parser for
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accessing feeds from external sources.
## Related
* [blog module ](http://silverstripe.org/blog-module )
## API Documentation
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* `[api:RSSFeed]`
