Loop to pull content from parent element in custom post type [duplicate]

Question

This question already has an answer here:

• How to add dynamically the main parent pages's custom fields and their values to all sub-pages? 1 answer

I created a hierarchical custom post type called "films." It is hierarchical so it can have children elements.

I am using a conditional statement in my single-films.php to show different content for the parent page from the children pages like so:

<?php if( $post->post_parent != 0 ) {
    echo "Press Page";
} else {
    echo "Film Page";
} ?>

In the condition that the page is a child, I want to use a custom wordpress loop, that loops through it's parents content. I am guessing I will need to use a loop similar to this (for the children):

<?php $posts = query_posts('&post_parent=0'); ?>
<?php while(have_posts()) : the_post(); ?>

wordpress content

<?php endwhile; ?>

This isn't working correctly. I need it to pull any content I wish (custom field, title, featured image, etc) from it's parent. Any idea how I can modify this loop to pull content from it's parent?

Answer 1

Use the following to change the query from querying the current page to querying the parent of the current page:

query_posts( 'p='.$post->post_parent  );

That will change the $wp_query object to hold only the parent of the current post.

Note: this is untested.

update

You can also do it with a custom WP_Query as so:

$args = array(
    'p' => $post->post_parent
);
$parent = new WP_Query( $args );

while( $parent->have_posts() ) : $parent->the_post();
    // loop stuff here
endwhile;

Answer 2

Use get post meta to extract the parents custom field:

for an image:

<?php

$image = wp_get_attachment_image_src(get_post_meta($post->post_parent, 'custom-field-key', true));
echo '<img src="' . $image[0] . '" />';
?>

For a text custom field:

<?php $variable = get_post_meta($post->post_parent, 'custom_field_name', true); ?>