Question

Can someone tell me how to modify the code below so that it filters out revisions? I tried using revision deletion plugins but they only work for revisions of posts or pages… not custom post types.

<?php

global $wpdb;
global $post;

$review_id = $post->ID;

if (get_post_type($review_id) == "features") {
   $assoc_id = get_post_meta($review_id, "associated_hosts_value", true);
  $review_id = intval($assoc_id);
}

$assoc = $wpdb->get_col("SELECT DISTINCT post_id from wp_postmeta WHERE (meta_key='associated_hosts_value') AND ((meta_value LIKE ',{$review_id},%') OR (meta_value LIKE '%,{$review_id},%') OR (meta_value = '{$review_id}') OR (meta_value LIKE '%,{$review_id}'));");

Answer 1

Revision is stored in wp_posts under the post_type column, so you will need to inner join on wp_posts and query for a post_type NOT IN ('revision'):

"SELECT DISTINCT post_id from {$wpdb->postmeta} INNER JOIN {$wpdb->posts} ON ID = post_id WHERE post_type NOT IN ('revision') ..."

By the way, inserting raw SQL queries in to get_col is a bad practice, as it leaves you vulnerable to SQL injections. Use $wpdb->prepare() as shown here:

http://codex.wordpress.org/Class_Reference/wpdb#Protect_Queries_Against_SQL_Injection_Attacks

Note that you will need to escape the % used in the LIKE statements by changing them to %% to work within prepare().

Also, you shouldn’t hard code WP table names in to your query statements. The wpdb class stores table names for use in constructing your queries, i.e. $wpdb->posts, $wpdb->postmeta. Using these assures that your plugin will always query the correct WP tables. Try your code in a multi site installation to find out why this is important.