[Résolu] How would I create a feed of child posts only for a specific parent?

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[daveM]

I am trying to: I have created a custom post type, "artist", that I've made a parent of the default WP "post" type. I would like to create a feed in a php template that only shows 'post's that are children of a certain 'artist' post. I'm not using Views, so I have a WP_Query loop, but I'm not sure how to specify this parent/child relationship.

I visited this URL: This page gave me a lot of info about creating the parent/child relationship, but it only explains how to show them on the front-end using Views. It doesn't say how to access the child post types using a WP php template - https://toolset.com/documentation/toolset-training-course/part-8-one-to-many-relationships-in-toolset/

Can you explain how I would specify the child/parent relationship in my loop? Thanks!

[Shane]

Hi Dave,

Thank you for contacting our support forum.

Actually the snippet of code you need to focus on is this right here.

//It will query all child posts of the current event, that are appearance type
$child_posts = types_child_posts('appearance');
foreach ($child_posts as $child_post) {
    $band_id = wpcf_pr_post_get_belongs($child_post->ID, 'band');
 
    //You can also use WP Native API get_post_meta to get the parent post ID
    //as it is stored in a hidden custom field _wpcf_belongs_post-type-slug_id
    //$band_id = get_post_meta($child_post->ID, '_wpcf_belongs_band_id', true);
 
    $band = get_post($band_id);
    echo $band->post_title;
}

Where you will need to replace appearance with the slug of your parent cpt. Add that to your Parent Post type template and it will display the child posts.

Please let me know if this helps.
Thanks,
Shane

[daveM]

Hi Shane, thanks for the reply! That definitely helps.

I was hoping to produce a loop of all child posts. This is what I had:

$parentID = wp_get_post_parent_id( $post_ID );
$args = array(
    'post_type' => 'post',
    'post_parent' => $parentID,
);
$query = new WP_Query( $args );

if ( $query->have_posts() ) {
	echo '<ul class="artist">';
	while ( $query->have_posts() ) {
	    	$query->the_post();
	    	echo '<li>' . the_post_thumbnail();
	    	echo '<div class="artist-news-text"><p class="artist-news-date">' . get_the_date() . '</p>';
	    	echo '<h2>' . get_the_title() . '</h2>';
	    	echo '<p class="artist-news-excerpt">' . get_the_excerpt() . '</p>';
	    	echo '<a class="artist-news-read-more" href="' . get_permalink( get_the_ID() ) . '">Read More</a></div>';
	    	echo '</li>'; 
        }
	echo '</ul>';
        } else {
        	/* show 404 error here */
		echo '<p class="artist-no-news">There is no news for this artist at this time.</p>';
        } wp_reset_postdata();

Is there a way I could incorporate what you posted into the loop I already have?
Thanks!

[Shane]

Hi Dave,

This code is listing out all the child posts for the currently viewed parent correct?

Please let me know.

Thanks,
Shane

[daveM]

Well, the code I just posted seems to list out all posts regardless of parent. I need to limit it to only show children of the current post. Is that possible with the code I posted?

I'd like to use the loop I posted because I already have all of the post content that I want set.

[Shane]

Hi Dave,

Thanks for the clarity.

In order for this to work with your present code a few modifications must be made.

Replace this line below.

$args = array(
    'post_type' => 'post',
    'post_parent' => $parentID,
);

With

$args = array(
    'post_type' => 'post',
    'meta_query' => array(
		array(
			'key'     => '_wpcf_belongs_PARENT_id',
			'value'   => $parentID,
			'compare' => '=',
		),
	),
);

Where you will replace the word PARENT in _wpcf_belongs_PARENT_id with the slug of your Parent CPT.

Please try this and let me know if it helps.
Thanks,
Shane

[daveM]

Hi Shane,

Thanks for the reply! I switched out that code and replaced PARENT with the slug of my parent CPT, but now it's not showing any posts at all. The 'if' statement fails and my 'else' fires: "There is no news..."

This is my new code:

$parentID = wp_get_post_parent_id( $post_ID );
$args = array(
    'post_type' => 'post',
    'meta_query' => array(
         array(
             'key'     => '_wpcf_belongs_artist_id',
	     'value'   => $parentID,
	     'compare' => '=',
         ),
     ),
);
$query = new WP_Query( $args );
 
if ( $query->have_posts() ) {
    echo '<ul class="artist">';
    while ( $query->have_posts() ) {
            $query->the_post();
            echo '<li>' . the_post_thumbnail();
            echo '<div class="artist-news-text"><p class="artist-news-date">' . get_the_date() . '</p>';
            echo '<h2>' . get_the_title() . '</h2>';
            echo '<p class="artist-news-excerpt">' . get_the_excerpt() . '</p>';
            echo '<a class="artist-news-read-more" href="' . get_permalink( get_the_ID() ) . '">Read More</a></div>';
            echo '</li>'; 
        }
    echo '</ul>';
        } else {
            /* show 404 error here */
        echo '<p class="artist-no-news">There is no news for this artist at this time.</p>';
        } wp_reset_postdata();

It seems like this should work. Any idea why it's not?
Thanks for your help!

[Shane]

Hi Dave,

This code is going on the current parent post template correct?

Try this.

Replace this

$parentID = wp_get_post_parent_id( $post_ID );

With

$parentID = get_post_id( );

This will only give the correct results if the code is being placed in the template file of the parent.

Thanks,
Shane

[daveM]

Ah, exactly. I just did the same after realizing which parent ID I was trying to get! Perfect! Thanks for all your help! Sorry if I was unclear!

[daveM]

Hello, I had one additional question related to this: How would I get a feed of WooCommerce products that are also children of my "Artist" post type?

I have the follow arguments using the same type of WP_Query as above:

$args = array(
	'post_type' => 'products',
	'posts_per_page' => 8,
	'meta_query' => array(
	    array(
		'key'     => '_wpcf_belongs_artist_id',
		'value'   => $parentID,
		'compare' => '=',
	    ),
         ),
);

Is this the correct arguments to pull WooCommerce products related to my custom post type? Thanks!

[daveM]

I just wanted to check in and see if anyone had some tips of displaying child product post types. See above for context and code. Thanks!

[daveM]

Apologies. I had my WooCommerce product post type slug wrong. It's working now with the same code as above! Thanks!