David,
For the acf/validate_save_post action this can easily be done, without “hacking”, using the built in edit_form_after_title action and add a hidden input field with the acf[post_id] name.
The AJAX post on the post edit screen will serialize all acf named inputs, so in this way, you can easily use the post_id in one of your own acf/validate_save_post hooks. 🙂
// acf/validate_save_post
add_action( 'edit_form_after_title', 'devplus_edit_form_after_title' );
function devplus_edit_form_after_title(){
global $post;
if( $post && isset( $post->ID ) ){
?>
<input type="hidden" name="acf[post_id]" value="<?php echo $post->ID; ?>" />
<?php
}
}
Happy ACF coding!
// T
