I need to display all posts of a custom type at once, therefore I do something like following:
`function me_get_all_posts_for_export($post_type, $min_date)
{
$posts = get_posts(array(
‘post_type’ => $post_type,
‘posts_per_page’ => PHP_INT_MAX,
‘post_status’ => ‘publish’,
‘cache_results’ => false,
‘suppress_filters’ => false,
‘date_query’ => array(
‘after’ => $min_date,
‘inclusive’ => true
)
));
return $posts;
}`
Now I want to extend this query to directly load all relations I have instead of having to iterate over all posts and make queries for custom fields one by one (via get_field). Can I somehow tell wordpress to join the custom fields into my query automatically at once?
Single queries per posts are damn slow…
This isn’t part of what you asked, but You can use -1 for posts_per_page to tell WP to get all of the posts
<code>posts_per_page</code> => -1,
But as far as your real question goes, no. WP_Query is not capable of doing joins to other posts through a custom field. For something like this you would need to write your own SQL query and use https://codex.wordpress.org/Class_Reference/wpdb and then write your own code to loop over and display the results.
