Here’s a way that could be “best” depending on the circumstance: const { meta } = wp.data.select( ‘core’ ).getEntityRecord( ‘postType’, ‘post’, 123 ); This tutorial might be helpful for related stuff.
Wishlist Icon in Divi Blog module (loop)
How can meta values from another site in a multisite be used in a custom query?
$value is always empty because post ID is missing. Pass the parameter ($post object) to the hide_title_callback() function and get the post ID right way. Also, you should take care of nonces. <?php // pass the $post object function hide_title_callback( $post ) { // you have to verify this nonce inside `mysite_save_postdata()` // https://codex.wordpress.org/Function_Reference/wp_nonce_field wp_nonce_field( … Read more
So, in my case, the answer was simple, though it took a long time to find. Just in case anyone else ever has this issue, here is what solved it for me: I was calling the register_post_meta in a file that was only being included if is_admin() returns true (this is a plugin metabox conversion, … Read more
add_post_meta not working within AJAX function
Calling metadata in a single.php file
How can I get or the intermediate size of an image with wp_get_attachment_image_src without using post meta?
Although the suggested answer from admcfajn wasn’t the solution to the problem/question, it did lead me to look explore it further. Thanks admcfajn. Assuming you are using either the default intermediate e.g. thumbnail or custom sizes e.g. 320w and would like to include additional sizes such as full, you can use wp_update_attachment_metadata( $attachment_id, $metadata );
Force-update the meta variable first set using `var [ meta, setMeta = useEntityProp( ‘postType’, postType, ‘meta’ );`