taxonomy-post-columns.php

<?php
/**
 * Taxonomy Post Columns
 * @link http://www.billerickson.net/code/add-taxonomy-to-edit-post-columns
 *
 * @package      Core_Functionality
 * @since        1.0.0
 * @link         https://github.com/billerickson/Core-Functionality
 * @author       Bill Erickson <bill@billerickson.net>
 * @copyright    Copyright (c) 2011, Bill Erickson
 * @license      http://opensource.org/licenses/gpl-2.0.php GNU Public License
 */


/**
 * Custom Post Columns
 * @link http://scribu.net/wordpress/custom-sortable-columns.html
 *
 * @param array $defaults
 * @return array
 */
function be_custom_post_columns($defaults) {
    $defaults['technology'] = 'Technologies';
    $defaults['industry'] = 'Industries';
    $defaults['product'] = 'Products';
    unset( $defaults['tags'] );
    return $defaults;
}
add_filter( 'manage_edit-post_columns', 'be_custom_post_columns' );

/**
 * Custom Post Columns Data
 *
 * @param string $column_name
 * @param int $post_id
 * @return null
 */
function be_custom_post_columns_data( $column_name, $post_id ) {
	$taxonomies = array( 'technology', 'industry', 'product' );
	$post_type = 'post';
	foreach( $taxonomies as $taxonomy ) {
		if( $column_name == $taxonomy ) {
			$terms = get_the_terms( $post_id, $taxonomy );
			if ( !empty( $terms ) ) {
				$output = array();
				foreach ( $terms as $term )
					$output[] = '<a href="' . admin_url( 'edit.php?' . $taxonomy . '='.  $term->slug . '&post_type=' . $post_type ) . '">' . $term->name . '</a>';
				echo join( ', ', $output );
			}
			else {
				_e('Uncategorized');
			}
		
		}
	}
}
add_action( 'manage_posts_custom_column', 'be_custom_post_columns_data', 10, 2 );

/**
 * Make Custom Columns Sortable
 *
 * @param array $columns
 * @return array
 */
function be_custom_post_columns_sortable( $columns ) {
	$columns['technology'] = 'technology';
	$columns['industry'] = 'industry';
	$columns['product'] = 'product';
 
	return $columns;
}
add_filter( 'manage_edit-post_sortable_columns', 'be_custom_post_columns_sortable' );

/**
 * Custom Post Columns Orderby
 *
 * @param array $args
 * @return array
 */
function be_custom_post_columns_orderby( $args ) {
	$taxonomies = array( 'technology', 'industry', 'product' );
	if ( isset( $args['orderby'] ) && in_array( $args['orderby'], $taxonomies ) ) {
		$taxonomy = $args['orderby'];
		$tax_terms = get_terms( $taxonomy, array( 'fields' => 'ids' ) );
		$args = array_merge( $args, array(
			'orderby' => 'title',
			'order' => 'ASC',
			'tax_query' => array(
				array(
					'taxonomy' => $taxonomy,
					'field' => 'id',
					'terms' => $tax_terms,
				)
			)
		) );
	}
 
	return $args;
}
add_filter( 'request', 'be_custom_post_columns_orderby' );