Well if I had thought about how much work with was going to be before writing it, you wouldn’t be able to get me points right now. 🙂 Needless to say, it’s rather involved (though I don’t think it really should have to be, but it is what it is.)
First off, you can’t (easily) do it like you wanted; the problem is how to differentiate between these two URLs:
-
Event Type = “Day Time”, Event
Title = “For a Change” -
Event Type = “Day”, Event Title =
“Time For a Change”
Both would have a portion of their URLs looking like this and how could we tell which is which?
day-time-for-a-change
So, I modified your pattern to use tildes (~) as separators and that works fine:
http://www.domain-name.com/events/<taxonomy-term>~event-title~<custom-field>/
Anyway, I wrote a plugin that does what you need. It does the following things:
-
It sets the rewrite rule in the the plugin activation hook using
$wp_rewrite->add_rule(). -
It applys the pattern to create actual event post links using the
'post_type_link'hook, and -
It simplifes editing of the URL slug by using the
'get_sample_permalink_html'hook (I didn’t try to show the full URL because it would have been too tricky for something I’m writing for free. 🙂
So here’s what the edit screen looks like:
(source: mikeschinkel.com)
Which produces this view on the front end:
(source: mikeschinkel.com)
And here ya go with the plugin code (let me know if you have questions, but not toooo many. ;-):
<?php
/*
Plugin Name: SEO URLs for Events
*/
if (!class_exists('SeoUrlsForEvents')) {
class SeoUrlsForEvents {
static function on_load() {
add_action('init', array(__CLASS__,'init'));
add_filter('post_type_link', array(__CLASS__,'post_type_link'),10,4);
add_filter('get_sample_permalink_html',array(__CLASS__,'get_sample_permalink_html'),10,4);
}
static function get_sample_permalink_html($sample, $post_id, $new_title, $new_slug) {
$post = get_post($post_id);
if ($post->post_type=='event') {
$post_slug = self::make_post_slug($post);
if ($post_slug) {
$sample = str_replace('<strong>Permalink:</strong>','<strong>Permalink Slug:</strong>',$sample);
$sample = preg_replace('#(<span id="sample-permalink">).+?(<span id="editable-post-name" title="Click to edit this part of the permalink">).+?</span>/</span>#Us',"$1$2{$post->post_name}</span></span>",$sample);
$permalink = get_post_permalink($id);
$sample = preg_replace("#(<span id='view-post-btn'><a href="https://wordpress.stackexchange.com/questions/7468/).+?(" class="button" target="_blank">View Post</a></span>)#","$1{$permalink}$2",$sample);
}
}
return $sample;
}
static function make_post_slug($post) {
$post_slug = false;
$post = (object)$post;
if ($post->post_type=='event') {
$when = get_post_meta($post->ID,'when',true);
if (!empty($when)) { // If we don't have a when, use default
$types = wp_get_object_terms($post->ID,'event-type');
if (count($types)) // If we don't have an event-type, use default else use the first one
$post_slug = "{$types[0]->slug}~{$post->post_name}~{$when}/";
}
}
return $post_slug;
}
static function post_type_link($post_link, $post, $leavename, $sample) {
if ($post->post_type=='event' && $sample) {
$post_link = '%event%';
} else {
$post_slug = self::make_post_slug($post);
if ($post_slug) {
$post_link = get_bloginfo('wpurl') . '/events/' . $post_slug;
}
}
return $post_link;
}
static function activate() {
global $wp_rewrite;
$wp_rewrite->add_rule('events/([^~]+)~([^~]+)~([^/]+)','index.php?post_type=event&taxonomy=event-type&term=$matches[1]&name=$matches[2]&meta_key=when&meta_value=$matches[3]', 'top');
$wp_rewrite->flush_rules(false);
}
static function init() {
register_post_type('event',
array(
'label' => 'Events',
'public' => true,
'rewrite' => array('slug' => 'events'),
'hierarchical' => false,
'supports' => array('title','editor','custom-fields'),
)
);
register_taxonomy('event-type', 'event', array(
'hierarchical' => false,
'label' => 'Event Types',
'rewrite' => array('slug' => 'event-types' ),
)
);
}
}
SeoUrlsForEvents::on_load();
}
register_activation_hook(__FILE__,array('SeoUrlsForEvents','activate'));