Description
This is a convenience class and collection of methods to make creating new custom post types with their own metaboxes easy.
The general idea is to define a function that’s hooked to the
register_post_types
action. The function defines a class for your post type that extends the
GO_Cpt
class. This follows a design pattern established by the modern widgets API (as introduced in WP 2.8) https://codex.wordpress.org/Widgets_API#Developing_Widgets .
The result is a new custom post type and much easier creation and updating of custom meta associated with that post type. You’ll also have a convenient object you can use to access the metadata associated with each post.
function my_customposttype() { class My_CustomPostType extends GO_Cpt { function __construct() { // execute the parent constructor with the name
// and definition for the custom post type parent::__construct( $post_type_name , $post_type_definition ); } function metabox( $post , $meta ) { // print out the form here //
// this method is optional, only use it if you want to
// add a metabox to your custom post type } function update( $new_meta , $old_meta ) { // sanitize and validate the metadata // then return $meta so it can be saved // // this method is required if a
// metabox() method is included } } global $my_customposttype; $my_customposttype = new My_CustomPostType; } // hook that function to the register_post_types action add_action( ‘register_post_types’ , ‘my_customposttype’ );
Backstory: defining the post type class inside the function avoids issues with loading order and fatal errors resulting from attempting to extend a class that might not exist yet. Isn’t PHP awesome?
See the included hello world example: https://plugins.trac.wordpress.org/browser/go-cptfactory/trunk/example-helloworld-cpt.php
To access the meta associated with a post, you can call
$my_customposttype->get_meta( $post_id );
You can easily add a method and hook to filter
the_content
or
the_excerpt
to insert custom values that may have been entered in the post meta. Simply add
add_filter( ‘the_content’ , array( $this , ‘the_content’ ));
in the
__construct()
and then define another method in the
My_CustomPostType
class such as:`
function the_content( $content ) {
$meta_print = print_r( $this->get_meta( get_the_ID() ) , TRUE );
return $meta_print . $content
}
`