I'm trying to add a custom template for all posts in a sub-sub-category. I mean like

Category --> SubCategory Level 1 --> Subcategory Level 2 --> post

I'm using the following code:

  $post = $wp_query->post;

  if (cat_is_ancestor_of( 42, $cat ) ) {
  } else {

However, it only shows a blank page, both in the sub-sub-cat post as well as all teh other posts. I double checked and the templates are there, so I guess there's something wrong with my code, but can't figure what

edit: I have several CPT single pages named single-{CPT-slug}.php . Is it possible this is affecting things?

  • Do you debugging turned on? Where have you added this code?
    – ngearing
    Commented Apr 14, 2018 at 3:47

1 Answer 1


Instead of include(), use get_template_part()


<?php $post = $wp_query->post; if (cat_is_ancestor_of( 42, $cat ) ) { get_template_part( 'services', 'template' ) } else { get_template_part( 'single', 'default' ); } ?>

If you create those files and use get_template_part(), then within those files you can set them up to display posts however you see fit. Take a look at the Underscores theme on github, the archive.php file has a good example of using get_template_part() within the loop -


Here is a link as well to one of the template_parts for Underscores to see how they set it up within that file -


Tom Mcfarlin explains this extremely well here -


Response to your edits: Your single-{CPT-slug}.php templates should not cause any issues with this.

  • this doesn't answer the question at all Commented Apr 13, 2018 at 23:48
  • I updated my original comment with the code for this.
    – lavekyl
    Commented Apr 14, 2018 at 3:11
  • Some more details are needed to fully understand and answer this. What file is this code in? Is this a page template, or is this a single-{CPT slug}.php file or an archive-{CPT slug}.php file? Turning on debug mode would also be helpful to help answer this.
    – lavekyl
    Commented Apr 18, 2018 at 15:36

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