ACF relationship fields – get_field values from other post type

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In my POSTS page (regular post type), I have setup a ACF relationship field. Inside this I can select company name which are all under the post type of directory_listings.

Now, I have the following code on the directory listings page, and therefore using simply get_field does not work because those values are not on this page, they are elsewhere on the POST type instead.

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So unsure how to grab the information.

Code on one of the pages which is under the DIRECTORY_LISTINGS post type: 

$posts = get_field('related_articles');

if( $posts ): ?>
    <ul>
    <?php foreach( $posts as $post): // variable must be called $post (IMPORTANT) ?>
        <?php setup_postdata($post); ?>
        <li>
            <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
        </li>
    <?php endforeach; ?>
    </ul>
    <?php wp_reset_postdata(); // IMPORTANT - reset the $post object so the rest of the page works correctly ?>
<?php endif; ?>

Example diagram as I am not great with explaining via text.
enter image description here

Currently I have setup the relationship field on the company edit page (directory_listing) instead. It works when doing the following:
1) Related Posts to this business listing -> select a post -> publish – > now displays the list on the business listing page. Example here: http://bit.ly/1vwydDl (bottom of the page)

2) I’d like from the POST edit page select a business which posts will appear on. I can put the field there via ACF no problem but getting it to actually display the results I cannot figure out.

Post Views: 1

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3 comments

  1. Background Info:

    get_field() has three parameters:

    1. $field_name: the name of the field to be retrieved. eg “page_content” (required)
    2. $post_id: Specific post ID where your value was entered. Defaults to current post ID (not required). This can also be options / taxonomies / users / etc
    3. $format_value

    If you were only concerned with grabbing a specific post (of which you knew the ID), the key would be the second parameter ($post_id). There’s nothing really magical about ACF. Quite simply: the meta_value (i.e. the directory listing the post is tied to) is saved to each post (attached to that post’s $post_id).

    However, in your case, we don’t know the ID of the post(s) we want to get.

    Solution:

    If we explain what you want to do in a simple sentence, that sentence would look something like:

    Show/get posts on a directory_listings (custom post type) page which have a meta_value which points to that page.

    Obviously, you can’t use get_field(), because your problem has nothing to do with “getting a field.” Rather, you need to “find the posts that have a specific field.” ACF has great documentation on this.

    Luckily for you, WordPress ships with an awesome class called a WP_Query, and a similarly awesome function called get_posts(). So looking back at our sentence above and translating it into a function, we want to: get_posts() where the meta_key has a value of the current $post_id.

    Or, more specifically, on your directory_listings page, you’d have the following query:

    $related_articles = get_posts(array(
    'post_type' => 'post',
    'meta_query' => array(
        array(
            'key' => 'related_articles', // name of custom field
            'value' => '"' . get_the_ID() . '"',
            'compare' => 'LIKE'
        )
    )
));

if( $related_articles ): 
    foreach( $related_articles as $article ): 

    // Do something to display the articles. Each article is a WP_Post object.
    // Example:

    echo $article->post_title;  // The post title
    echo $article->post_excerpt;  // The excerpt
    echo get_the_post_thumbnail( $article->ID );  // The thumbnail

    endforeach;
endif;

  2. If it’s a custom field you are looking for within that query then you can do it like this:

    <?php
$posts = get_field('related_articles');

if( $posts ): ?>
    <ul>
    <?php foreach( $posts as $post): // variable must be called $post (IMPORTANT) ?>
        <?php setup_postdata($post); ?>
        <li>
            <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
            <?php the_field('your_custom_field',$post); ?>
        </li>
    <?php endforeach; ?>
    </ul>
    <?php wp_reset_postdata(); // IMPORTANT - reset the $post object so the rest of the page works correctly ?>
<?php endif; ?>

  3. If I understood this correctly this is the same problem than the one I had.
    In my case I preferred working with shortcodes.
    Using [acf field="person"] with the field being a relationshipt only gave me the ID of the person, but I was unable to acces their fields.
    On the other hand, using [acf field="last_name", post_id=[acf field="person"], which would be an ideal solution does not work as the wordpress parser does not allow nested shortcodes.

    that is why I cam up with this very small php solution:

    function import_cf_from_cpt( $atts ) {
    // import custom fields from other custom post types that are connected via a relationship to the calling custom post type
    // shortcode: [import <field from calling CPT of type relationship> <field name from field from other CPT>]
    // ex [import person last_name] --> Doe

    $postID = do_shortcode("[acf field={$atts[0]}]");
    // we use the first attribute to get the ID of the object
    $postField = get_field($atts[1], $postID);
    // next, using the ID we look for the field of the second attribute.
return $postField;
}
add_shortcode( 'import', 'import_cf_from_cpt' );

    Placing this in the functions.php file allows to use the shortcode

    [import person last_name] for example, or any other combination to import field values from other posts.