add_post_meta for all custom posts that dont have the metakey yet

Question

For custom post type "bedrijf", i created a possibility where visitors can leave a rating. If they do, the meta key and value is added and saved. If there is more than one, the average is calculated and the value field is updated.

However, most custom posts don't have a meta key and value yet and i want them to have one with value "0".

The code I got so far:

function create_metadata(){
    $args = array(
        'post_type' => 'bedrijf',
        'posts_per_page'   => -1,
    );
    $posts = get_posts($args);
    foreach ( $posts as $post ) {
        $av = get_post_meta($post->ID, 'averagerating', true);
        if (!isset($av)){
        add_post_meta( $post->ID, 'averagerating', '0' );
    }
    }
}
add_action('init','create_metadata');

But so far this didn't work.

score 0 · Answer 1 · answered Feb 21 '20 at 10:32

I found the problem, i had to use "new query" like this:

function create_metadata(){
        $query = new WP_Query(array(
        'post_type' => 'bedrijf',
        'posts_per_page' => -1,
        ));
    while ($query->have_posts()) {
        $query->the_post(); 
    if(!null == get_post_meta( get_the_ID(), 'averagerating', true )){
        add_post_meta( get_the_ID(), 'averagerating', '0' );
    }
}

add_post_meta for all custom posts that dont have the metakey yet

1 Answers1