Problem: I would like to get the parent post Course of the current post Product using the new Post Relationships API, but it doesn't seem to be working. I have tried both of these syntaxes:
$course = toolset_get_parent_post_by_type( $product, 'course' );
$courses = get_posts( array( 'post_type' => 'course', 'numberposts' => -1, 'toolset_relationships' => array( 'role' => 'parent', 'related_to' => $product_id, 'relationship' => array( 'course', 'product' ) ), ) );
Solution: In this case, the relationships were created in the new system, so toolset_get_parent_post_by_type is not appropriate. The toolset_get_parent_post_by_type API is intended for use with legacy relationships, or relationships that were migrated from the legacy system. When specifying the relationship to query, the array syntax is intended for legacy relationships as well. The best approach in this case is to use the toolset_get_related_posts API, and the relationship slug instead of the post type slug array:
$product = get_post(69); $course = toolset_get_related_post( $product, 'your-relationship-slug', 'parent');
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