Related post by custom field - wordpress

Question

I use wordpress acf custom post type to create my custop post type.
this code (in my custop post type page php) to display the related post of a taxonomy type, now i want to display by Custom Field instead of taxonomy. Thank you for helping me solve my problem
<?php
global $post;
$current_post_type = get_post_type( $post );
$args = array(
'posts_per_page' => 3,
'order' => 'DESC',
'orderby' => 'ID',
'post_type' => $current_post_type,
'post__not_in' => array( $post->ID )
);
$rel_query = new WP_Query( $args );
if( $rel_query->have_posts() ) :
?>
<h1 id="recent">Related</h1>
<div id="related" class="group">
<ul class="group">
<?php
// The Loop
while ( $rel_query->have_posts() ) :
$rel_query->the_post();
?>
<li>
<a href="<?php the_permalink() ?>" title="<?php the_title() ?>" rel="bookmark">
<article>
<h1 class="entry-title"><?php the_title() ?></h1>
<div class="name-date"><?php the_time('F j, Y'); ?></div>
<div class="theExcerpt"><?php the_excerpt(); ?></div>
</article>
</a>
</li>
<?php
endwhile;
?>
</ul><!-- .group -->
</div><!-- #related -->
<?php
endif;
// Reset the query
wp_reset_query();
?>

Answer 1

WP_Query Object accept arguments to query custom field values (more info here: https://www.advancedcustomfields.com/resources/query-posts-custom-fields/). So you need the name of your custom field in this example 'location' and then the value you want 'Melbourne' (you will get the value using get_field('location')).
So your args should look like this:
$args = array(
'posts_per_page' => 3,
'order' => 'DESC',
'orderby' => 'ID',
'meta_key' => 'location',
'meta_value' => 'Melbourne'
'post_type' => $current_post_type,
'post__not_in' => array( $post->ID )
);
Hope this helps