Custom Post Types and Taxonomies

Custom Post Types & Taxonomies
WordPress just got CMSier

Who Am I?
I am a self-taught, freelance designer who has leveraged trial, error, and observation to become a WordPress expert.
While I specialize in WordPress themes and CMS development, I also do all levels of Web Design and XHTML/CSS coding.
I freelance some through my personal brand, Tammy Hart Designs, and I also work a full time gig at Infomediahere in Birmingham.
TammyHartDesigns.com tammy@tammyhartdesigns.com @tammyhart

What is a Post Type?
Posts, pages and more! Oh my!

How Does it Work?
Content goes into the posts table
Each content item is assigned a post_type
Custom types are now easier to create and manage

Built in Types
Main Content
Post
Page
Other
Attachment
Revision
Nav Menu Item

What Is a taxonomy?
Read my lips, now new taxonomies

How Do They Work?
Terms and their unique ID’s are saved in the terms table
Terms are assigned a taxonomy in the term_taxonomy table
Terms are related to posts (of all types) in the term_relationships table

Built in Taxonomies
Post Taxonomies
Category
Post Tag
Other
Link Category
Nav Menu

Hand Coding
The hard way

Register a Post Type
function post_type_movies(){
register_post_type('movies',
array('label'=> __('Movies'),
'public'=>true,
'show_ui'=>true,
'supports' =>array(
'post-thumbnails',
'excerpts',
'trackbacks',
'custom-fields',
'comments',
'revisions')
)
);
register_taxonomy_for_object_type('post_tag', 'movies');
}
add_action('init', 'post_type_movies');
First Impressions of Custom Post Type by Frank Bültge on WPEngineer.org
http://bit.ly/posttypes

Default Arguments
// Args prefixed with an underscore are reserved for internal use.
$defaults =array(
'label' =>false,
'publicly_queryable' => null,
'exclude_from_search' => null,
'_builtin' =>false,
'_edit_link' =>'post.php?post=%d',
'capability_type'=>'post',
'hierarchical' => false,
'public' => false,
'rewrite' =>true,
'query_var' =>true,
'supports' =>array(),
'register_meta_box_cb' => null,
'taxonomies' =>array(),
'show_ui' => null
);

The Taxonomy Code
function post_type_movies(){
…
register_taxonomy('actor', 'movies',
array(
'hierarchical'=>true,
'label'=> __('Actor')
)
);
register_taxonomy(‘director', 'movies',
array(
'hierarchical'=>false,
'label'=>__(‘Director'),
'query_var'=>‘director',
'rewrite' =>array('slug'=>‘director')
)
);
}
add_action('init', 'post_type_movies');

Using Plugins
The easy way

“
Overheard
WordCamp Birmingham 2009
WordPress is the iPhone of the internet. You’ll always hear, “There’s a plugin for that!”

Plugins for Creating Them
Custom Post Type UI
Creates both
TONS of labeling options
WP Post Type UI
Creates both
Buggy
Allows a custom icon
More Types & More Taxonomies
Allows you to override built in types and taxonomies
Allows a custom icon
Works seamlessly with the More Fields plugin (stay tuned for more)

Plugins for Manipulating Them
Custom Post Type Order
Drag and drop ordering
Simple Custom Post Type Archives
Adds support for custom post type archive permalinks
Adds new body classes to custom post type archives
Adds a new conditional, is_custom_post_type_archive
Fixes the wp_title output on custom post type archives to show the custom type's label
Adds custom post type feeds
And more…
Post Type Switcher
Change the post type one item at a time
Convert Post Types
Bulk edit post types

Custom Templates
Now what do I do?

Template Hierarchy
Custom Post Type
single-{post_type}.php
single.php
index.php
Custom Taxonomy
taxonomy-{taxonomy}-{term}.php
taxonomy-{taxonomy}.php
taxonomy.php
archive.php
index.php

Custom Loops & Queries
This gets hardcore

The Loop
The Basic Loop
<?
$loop =newWP_query('post_type=movies');
while ($loop->have_posts()): $loop->the_post();
?>
... Do Stuff Here ...
<?endwhile; ?>
Add Custom Taxonomies
$loop =newWP_query('post_type=movies&actor=joaquin-phoenix');
$loop =newWP_query('post_type=movies&actor=joaquin-phoenix&director=m-night-shyamalan');

Term Lists
Get All Terms
$terms =get_terms('actors', 'order_by=count&order=DESC');
Get Terms in a Post
get_the_term_list( $post->ID, 'actors', '<p>Actors: ', ',', '</p>' )
Other Functions
get_term
get_term_children
get_term_by
get_taxonomies

More Custom Content
But wait, there’s more!

“
Matt Mullenweg
WordCamp Birmingham 2009
I like what you’re doing; I just don’t like the way you’re having to do it. So I’m going to make it better.

No More Flutter
Custom Post Typesto create the special content
Custom Taxonomiesto organize the content
Custom Fieldsto get specific information on each post in a way that is human and pretty

Thanks!
Questions?
TammyHartDesigns.comtammy@tammyhartdesigns.com@tammyhart

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Custom Post Types and Taxonomies

by Tammy Hart

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