使用meta键获取所有具有自定义字段值的帖子，然后从另一个字段值循环查询结果

Question

how can i get all posts of both custom post type 'folder' and 'file' that have the same custom field value in custom field 'wpcf-secret-id-1' and in case if there are results i would like to show the value of another custom field 'wpcf-secret-id-2'.

I have tried following code but seems not to work:

 function get_all_post_from_field_value($postid) { $args = array( 'post_type' => array( 'folder', 'file' ), 'meta_query' => array( array( 'key' => 'wpcf-secret-id-1', 'value' => ( $postid ) ) ) ); // The Query $query = new WP_Query($args); // The Loop if ($query->have_posts()) { while ($query->have_posts()) { $query->the_post(); // I am not sure how to get the field value of 'wpcf-secret-id-2' return get_post_field('wpcf-secret-id-2'); } } } add_shortcode( 'get-posts-by-field-value', 'get_all_post_from_field_value'); 

I would like at the end to get all posts where first custom field value is the same of current post and show the results as a loop of the second custom field value

Answer 1

Looks like it should work, I don't see anything obviously wrong with your query.

The only thing that may be happening is: are these custom fields hidden? Have you looked in your post_meta table in your database to check the correct key to be querying for wpcf-secret-id-1 and wpcf-secret-id-2 ? If they are hidden from the backend, they may have an underscore prepended like this: _wpcf-secret-id-1 .

Also, your WP_Query usage isnt correct in this case. You are overriding the entire Wordpress Loop with $query->the_post(); and are returning out of the function before resetting it with wp_reset_postdata .

A better way to do that would be:

$query = new WP_Query($args);

if ($query->found_posts > 0) {

    $post = $query->posts[0];
    return get_post_meta($post->ID, 'wpcf-secret-id-2', true);
}
else
{
   return ""; //Good habit: if you are returning some value, make sure you always return *something*, even when there is no value to return.
}