I'm trying to do a custom query which is outside the scope of a single WP_Query, I think I should be using $wpdb but my SQL is a bit ropey. Also I only need the post IDs returned not post objects.

Basically I need to find all posts with a meta value of $foobar whose parent post has one or more specific terms. I.E:

GET all my_custom_post_type posts
IF their postmeta has a field my_custom_field with a value $foobar
AND their post_parent has the my_custom_tax terms foo & bar
RETURN the post's IDs as an array.

Any pointers would be great. Thanks!

  • 1
    Use a get_posts query for that – Pieter Goosen Aug 25 '15 at 11:59
  • 1
    @PieterGoosen They're all custom post types so do use both post parents and taxonomies. Using get_posts I can't query the parent's taxonomy. – Jamie Aug 25 '15 at 12:09

You can still use get_posts:

$parents = get_posts(
        'posts_per_page' => -1,
        'post_type'      => 'my_custom_post_type',
        'fields'         => 'ids', // Just get IDs, not objects
        'tax_query'      => array(
                'taxonomy' => 'my_custom_tax',
                'field'    => 'slug',
                'terms'    => array(

$post_ids = get_posts(
        'posts_per_page'  => -1,
        'post_parent__in' => $parents,
        'post_type'       => 'my_custom_post_type',
        'fields'          => 'ids',
        'meta_query'       => array(
                'key'   => 'my_custom_field',
                'value' => $foobar,

Further reading on tax queries and meta queries.

  • Fantastic. Seems so obvious now! I guess I was overthinking it trying to wrap it up in a single query. Thank you. – Jamie Aug 25 '15 at 12:51

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