Tuesday, September 27, 2022
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Updated: 30. 9. 2022, Added: 27. 9. 2022

Use first ACF Gallery image as Featured image of Custom post type single

How do I set the first gallery image from a custom post type gallery field as the featured image? Found this here: Use first image from gallery of custom post type to set featured image - ACF Support (advancedcustomfields.com)

It use ACF | acf/save_post (advancedcustomfields.com) filter to apply.

add_action('acf/save_post', 'flex_FeaturedImageSetByACF', 50);

function flex_FeaturedImageSetByACF() {

    $current_screen         = get_current_screen(); // Current admin screen needed to identify the current cpt
    $current_cpt_name       = 'models'; // Current cpt name
    $current_cpt_support    = 'thumbnail'; // We want to check if the CPT supports this feature

    global $post;

    $post_id                = ( $post->ID ); // Current post ID
    $post_gallery_field     = get_field('model_gallery', $post_id ); // ACF field

    if  ( !empty( $post_id ) ) {

        if ( isset( $post_gallery_field['0'] ) ) {

            $post_image_id          = $post_gallery_field['0']['id']; // ACF image filed ID
            $post_image_url         = $post_gallery_field['0']['url']; // ACF image filed URL

            // If current cpt supports thumbnails/featured images

            if ( post_type_supports( $current_cpt_name, $current_cpt_support ) ) {

                if ( ( $post_image_url ) AND ( ( $post_image_url ) != ( get_the_post_thumbnail() ) ) ) {

                    update_post_meta($post_id, '_thumbnail_id', $post_image_id);

                }

            }

        } else {

            update_post_meta( $post_id, '_thumbnail_id', 0 );

        }

    }

}
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3 comments on “Use first ACF Gallery image as Featured image of Custom post type single”

  1. This is amazing thank you!
    I'm using the ACF gallery on woocommerce products.
    Can you advise How can I set the first ACG gallery image as the featured image of the product

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