Currently the relationship field queries and does “LIKE” searches on title, content, etc. With 400,000 published posts in our wp_posts table, long searches take over 30seconds to execute. I would like to limit this search to only looking at the title field, not the content since our users know the title they want to find.
currently I have done this:
function acf_relationship_query($args, $field, $post) {
$args['posts_per_page'] = 5;
$args['post_status'] = 'publish';
// return
return $args;
}
add_filter('acf/fields/relationship/query/name=related_posts_1', 'acf_relationship_query', 10, 3);
add_filter('acf/fields/relationship/query/name=book_callout', 'acf_relationship_query', 10, 3);
removing the drafts from the results and limiting the amount returned.
searching titles and content is something that is part of WP and not something that is specific to ACF. Basically, ACF does a standard query with the ‘s’ parameter set. This can be altered with quite a bit of work, but I don’t know if you can limit it only to the query being done by the relationship field.
I found some code here for removing the content from search. https://nathaningram.com/restricting-wordpress-search-to-titles-only/
The problem is that I do not think there is anything that will identify the query as being for the relationship field.
I’m having this exact same issue.
A couple hours of research on pre_get_post hasn’t given me a solution yet.
I haven’t seen any code examples, but according to the Codex it might be solved by adding something like this to your acf_relationship_query query $args:
$args['fields'] = 'post_title';
This might not remove the existing filters, however. I’ve emailed ACF for support on this issue.
