How to modify or customize ACF Relationship Search?

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Written By geekerhub

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ACF Relationship Search uses the default WordPress Search Method. So there is no difference between ACF Relationship search and WordPress Search.

If you have created a relationship field and would like to allow a search to work on a meta query or tax query then you need to work with the filter of ACF.

ACF filter which is related to the Relationship fields is ‘ACF/fields/relationship/query’

Now how one can use this filter to customize Relationship Result?
We need to use ‘pre_get_posts‘ filter when Relationship Search is executed and below snippet shows a basic start for your customization.
Use below code snippet in your functions.php:

/*This filter run before ACF execute query, so that one can hook 'pre_get_posts' filter for modification*/
add_filter('acf/fields/relationship/query', 'add_acf_relationship_pre_get_posts_filter', 10, 3);
function add_acf_relationship_pre_get_posts_filter($args, $field, $post_id) {
  add_filter('pre_get_posts', 'acf_relationship_pre_get_posts_filter');
  return $args;

function acf_relationship_pre_get_posts_filter($query) {
  remove_filter('pre_get_posts', 'acf_relationship_pre_get_posts_filter');
  if ($query->is_search()) {
    // modify the query as per your wish as we do with WordPress search like using custom meta query or tax query

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