Failed to set featured image from ACF image block

• FuSan

• January 25, 2022 at 9:36 pm

I am trying to follow the method described here (https://support.advancedcustomfields.com/forums/topic/set-image-as-featured-image). But It’s not working whatever I do. There is no change in the featured image. Note, I am in a custom post type and I am trying to do this for a block.

This is added to my themes functions.php

function acf_set_featured_image( $value, $post_id, $field  ){
    if($value != ''){
	    //Add the value which is the image ID to the _thumbnail_id meta data for the current post
	    update_post_meta($post_id, '_thumbnail_id', $value);
    }
    return $value;
}
// acf/update_value/name={$field_name} - filter for a specific field based on it's name
add_filter('acf/update_value/name=character_featured_image', 'acf_set_featured_image', 10, 3);

This is my field group.
https://ibb.co/XJ2wJJv

• FuSan

• January 28, 2022 at 11:55 am

After some debugging, I found that acf_set_featured_image function isn’t running.

add_filter('acf/update_value/name=character_featured_image', 'acf_set_featured_image', 10, 3);
I suspect my acf/update_value isn’t working here for some reason.

• FuSan

• January 29, 2022 at 5:23 pm

After some debugging, I found that acf_set_featured_image function isn’t running.

add_filter(‘acf/update_value/name=character_featured_image’, ‘acf_set_featured_image’, 10, 3);
I suspect my acf/update_value isn’t working here for some reason.

Ok, I was wrong here. I was using “Query Monitor” plugin to debug which didn’t properly show the result. The issue was $post_id was returning block id instead of post id.

So corrected code will be

function acf_set_featured_image( $value, $post_id, $field  ){
    if($value != ''){
		$post_id = get_the_ID() ? get_the_ID() : $_POST['post_id'];
	    //Add the value which is the image ID to the _thumbnail_id meta data for the current post
		update_post_meta($post_id, '_thumbnail_id', $value);
    }
    return $value;
}
// acf/update_value/name={$field_name} - filter for a specific field based on it's name
add_filter('acf/update_value/name=character_featured_image', 'acf_set_featured_image', 10, 3);

or

function acf_set_featured_image( $value, $post_id, $field  ){
    if($value != ''){
	    //Add the value which is the image ID to the _thumbnail_id meta data for the current post
		update_post_meta(false, '_thumbnail_id', $value);
    }
    return $value;
}
// acf/update_value/name={$field_name} - filter for a specific field based on it's name
add_filter('acf/update_value/name=character_featured_image', 'acf_set_featured_image', 10, 3);