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Make select list pull from CPT?

  • I am using a relationship field, inside a repeater, to pull from a custom post type right now and it works great. Issue is that for my situation I need to limit the selections for each row to just 1. So two questions;

    1. Is there a way to limit choices to 1 in relationship fields?
    2. If not, could there be a way to have a select list with values populated from custom post type titles?

  • Hi @thatryan,

    Thanks for the question.

    Yes this is possible, you will only need to make use of the acf/fields/relationship/query filter and modify the $args array that is used to query the posts in the field.

    The code will look like so:

    function my_relationship_query( $args, $field, $post_id ) {
        // limit number of posts
        $args['posts_per_page'] = 1;
    	// return
        return $args;
    // filter for every field
    add_filter('acf/fields/relationship/query', 'my_relationship_query', 10, 3);
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