Problem: I am trying to use a meta_query with the post relationships API toolset_get_related_posts, but it doesn't seem to be filtering as expected.
Solution: Some complex meta_queries, like using "IN" or "AND" with more than one term, fail with the post relationships API. Instead, you should use a standard WP_Query and add the toolset_relationships clause:
$args = array( 'numberposts' => -1, 'post_type' => 'child-post-type-slug', 'orderby' => 'post_date', 'order' => 'DESC', 'meta_query' => array( 'relation' => 'AND', array( 'key' => 'wpcf-colour', 'value' => 'Red', 'compare' => '=' ), array( 'key' => 'wpcf-description', 'value' => 'Ball', 'compare' => '=' ) ), 'toolset_relationships' => array( 'role' => 'child', 'related_to' => $post_id, 'relationship' => 'relationship-slug' ), ); $child_query = new WP_Query( $args );
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