[Resolved] Get parent from relationship with PHP: toolset_get_related_posts

[Author]

Posts

[KonstantinS88]

Unfortunately, neither the docs not the forum could help me. I want to find the post ID of a one to many relationship with PHP (i think i need the parent). How can i get this?

- The ID if the child is known
- The slug of the relationship is profil-nfc

Any help?

[Waqar]

Hi,

Thank you for contacting us and I'd be happy to assist.

To get the related posts in PHP code, you can use the "toolset_get_related_posts" function:
https://toolset.com/documentation/customizing-sites-using-php/post-relationships-api/#toolset_get_related_posts

For example, suppose you have a one-to-many relationship between "Shops" and "Books" with relationship slug "shops-books" and the current "Books" post ID is available in the $post->ID. Then the code to get the related parent "Shop" would look like this:

        // get children of a grandparent
        $query_by_element = $post->ID; // ID of post to get relationship from
        $relationship = 'shops-books'; // relationship slug
        $query_by_role_name = 'child'; // $query_by_element is a parent in this relation 
        $limit = 1000; // defaults
        $offset = 0; // defaults
        $args = array(); //nothing needed
        $return = 'post_id'; // We want Post ID
        $role_name_to_return = 'parent'; // We want children.
   
        $get_results = toolset_get_related_posts(
                        $query_by_element,
                        $relationship,
                        $query_by_role_name,
                        $limit,
                        $offset,
                        $args,
                        $return,
                        $role_name_to_return
                        );

I hope this helps and please let me know if you need any further assistance around this.

regards,
Waqar

[KonstantinS88]

Unfortunately, this does not work and returns an empty array all the time. Also, I guess post parent and child were misplaced in the snippet. But with the linked docs, I got it working with just one line of code:

//retrieve parent post ID from a one to many relationsship when knowing the child post-ID
$parent_id = toolset_get_related_post( $post->ID, 'profil-nfc', 'parent' );

[KonstantinS88]

My issue is resolved now. Thank you!