How to show ACF in a WP_Query loop with 'post_type' => 'product' - wordpress

Question

Try to achieve this:
I made a ACF (custom field) in my WooCommerce Product and now I try to get this field shown in my template with this code:
<ul class="products">
<?php
$args = array(
'posts_per_page' => 20,
'post_type' => 'product',
'tax_query' => array(
array(
'taxonomy' => 'product_type',
'field' => 'name',
'terms' => 'grouped',
),
),
);
$loop = new WP_Query( $args );
if ( $loop->have_posts() ) {
while ( $loop->have_posts() ) : $loop->the_post();
$linked_with_items = the_field('linked_with_items');
the_title('<strong>', '</strong>'); echo '<br />';
echo $linked_with_items;
endwhile;
} else {
echo __( 'No products found' );
}
wp_reset_postdata();
?>
</ul><!--/.products-->
But whatever I try also with get_field() the field does not show in my template.
Can someone help?
https://www.advancedcustomfields.com/
This is the final code fyi
<?php if( have_rows('catalogue') ): ?>
<?php
while( have_rows('catalogue') ): the_row(); // catalogue is the field
the_sub_field('linked_with_items'); ?>
<?php endwhile; ?>
<?php endif; ?>

Answer 1

You could try with this:
$linked_with_items = get_field('linked_with_items', get_the_ID());
If that doesn't work, just as a test, you could try to simply loop over posts with a foreach
foreach ( $loop->posts as $post ) {
$linked_with_items = get_field('linked_with_items', $post->ID);
}
If none of those work, please make sure that your product actually have that custom field, double check the ACF field settings (rule section), the field slug, and double check your product edit page to see if the fields shows there.