I've got a wordpress site with several custom post types. On a page, I want to display only posts of a custom type that have a specific tag. I've been using the following query to do so:

$args = array(
    'tag_slug__in'    => array('tag1', 'tag2'),
    'post_type'       => 'custom_post',
    'post_status'     => 'publish',
    'posts_per_page'  => 10,
    'order'           => 'ASC',
    'orderby'         => 'menu_order'

$posts = new WP_Query( $args );

However, when I run this query, I get both the page I have tagged like this, and a different custom post type (event) with the tags. However, I should have this limited to the stated custom_post type. I've double checked that the name I provided matches the name of the custom post type.

Obviously, I could trivially filter this myself at the start of the loop to only display my custom post type, but I want to properly handle returning no results. Is there a way to have the query properly filter my results to JUST posts with both this custom type and the listed tag(s)?

  • 1
    What is echo $posts->request; ?
    – birgire
    Apr 19, 2018 at 8:24
  • Weird, I just pulled that and got this: SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) WHERE 1=1 AND ( wp_term_relationships.term_taxonomy_id IN (16) ) AND wp_posts.post_type IN ('post', 'page', 'attachment', 'event', 'custom_post', 'custom_post2') AND ((wp_posts.post_status = 'publish')) GROUP BY wp_posts.ID ORDER BY wp_posts.menu_order ASC LIMIT 0, 10 Why would it be suddenly changing my filtered post types to all post types?
    – neomang
    Apr 19, 2018 at 14:36
  • 1
    Could be a plugin/theme that is changing the query.
    – birgire
    Apr 19, 2018 at 18:21

1 Answer 1


Since tag is a taxonomy of a custom_post post type, the query could look like this:

$args = array(
    'post_type'  => 'custom_post',
    'tax_query'  => array(
            'taxonomy'  => 'post_tag',
            'field'     => 'slug',
            'terms'     =>  array(

$posts = new WP_Query( $args );

See WP_Query Taxonomy Parameters.

  • This is wrong. A tag is not with tax_query. It should be possible with "tag_slug__in". If not you have done something wrong ....
    – yfain
    Jul 29, 2021 at 20:45
  • Built-in WordPress tags are not associated with custom post types by default and are assigned to regular posts only. The question was about a specially registered taxonomy for the custom post type.
    – Max Yudin
    Jul 31, 2021 at 6:54

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