커스텀 포스트의 카테고리 필터에 대한 기록

taxonomy-dropdown.php

<?php
/*
Plugin Name: Taxonomy Dropdown
Plugin URI: http://blog.changwoo.pe.kr
Description: 커스텀 포스트의 카테고리 필터 드롭다운 상자에 대해
Version: 1.0
Author: changwoo
Author URI: http://blog.changwoo.pe.kr
*/

add_action( 'init', 'taxdd_register_post_type' );
function taxdd_register_post_type() {

	register_taxonomy( 'collection-type', 'collection', array(
		'label'        => 'Collection Types',
		'hierarchical' => TRUE,
	) );

	register_post_type( 'collection', array(
		'label'      => 'collections',
		'public'     => TRUE,
		'taxonomies' => array( 'collection-type' )
	) );
}

register_activation_hook( __FILE__, 'taxdd_on_activated' );
function taxdd_on_activated() {
	taxdd_register_post_type();
	$book  = wp_insert_term( 'Book',  'collection-type', array( 'slug' => 'book' ) );
	$cd    = wp_insert_term( 'CD',    'collection-type', array( 'slug' => 'cd' ) );
	$stamp = wp_insert_term( 'Stamp', 'collection-type', array( 'slug' => 'stamp' ) );
	$book_id = wp_insert_post( array(
		'post_content' => 'It is a book.',
		'post_name'    => 'taxdd_book',
		'post_title'   => 'A book collection',
		'post_status'  => 'publish',
		'post_type'    => 'collection',
	) );
	$cd_id = wp_insert_post( array(
		'post_content' => 'It is a cd.',
		'post_name'    => 'taxdd_cd',
		'post_title'   => 'A cd collection',
		'post_status'  => 'publish',
		'post_type'    => 'collection',
	) );
	$stamp_id = wp_insert_post( array(
		'post_content' => 'It is a stamp.',
		'post_name'    => 'taxdd_stamp',
		'post_title'   => 'A stamp collection',
		'post_status'  => 'publish',
		'post_type'    => 'collection',
	) );
	wp_set_post_terms( $book_id, array( $book['term_id'] ), 'collection-type' );
	wp_set_post_terms( $cd_id, array( $cd['term_id'] ), 'collection-type' );
	wp_set_post_terms( $stamp_id, array( $stamp['term_id'] ), 'collection-type' );
}

register_deactivation_hook( __FILE__, 'taxdd_on_deactivated' );
function taxdd_on_deactivated() {
	taxdd_register_post_type();

	$query = new WP_Query( array(
		'post_type' => 'collection',
		'nopaging'  => TRUE,
		'fields'    => 'ids',
	) );
	$posts = &$query->get_posts();
	foreach( $posts as $post ) {
		wp_delete_post( $post );
	}

	$taxonomies = get_terms( 'collection-type', array( 'hide_empty' => FALSE ) );
	foreach( $taxonomies as $tax ) {
		wp_delete_term( $tax->term_id, 'collection-type' );
	}
}

add_action( 'restrict_manage_posts', 'taxdd_restrict_manage_posts' );
function taxdd_restrict_manage_posts() {

	if( !isset( $_GET['post_type']) || $_GET['post_type'] != 'collection' ) {
		return;
	}

	$term = get_term_by( 'id', $_GET['cat'], 'collection-type' );
	wp_dropdown_categories(
		array(
			'show_option_all'   => 'All Collections',
			'taxonomy'          => 'collection-type',
			'show_count'        => 0,
			'selected'          => $term->term_id,
			'hierarchical'      => TRUE,
			'name'              => 'cat',
			'value_field'       => 'term_id',
		)
	);

	// slug로 필터링하는 방법. 택소노미의 query_var와 name 속성을 맞췄다.
	// 다만 이렇게 하면 option 태그의 selected 속성이 출력되지 않는다.
//	$term = get_term_by( 'id', $_GET['collection-type'], 'collection-type' );
//	wp_dropdown_categories(
//		array(
//			'show_option_all'   => 'All Collections',
//			'taxonomy'          => 'collection-type',
//			'show_count'        => 0,
//			'selected'          => $term->slug,
//			'hierarchical'      => TRUE,
//			'name'              => 'collection-type',
//			'value_field'       => 'slug',
//		)
//	);
}

add_action( 'parse_tax_query', 'taxdd_parse_tax_query' );
function taxdd_parse_tax_query( $wp_query ) {
	$wp_query->tax_query->queries[0]['taxonomy'] = 'collection-type';
}