How to show specify category template for both parent and child category

Question

I tried to create a category template apply for parent and child specify category. I has create a file name 'category-1.php , in this file I used the loop for get the list of post:

<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
   // Show content of category post here.
<?php endwhile;?>
<?php endif; ?>

In the function file, I put this code:

function wpd_subcategory_template( $template ) {
    $cat = get_queried_object();
    if( 0 < $cat->category_parent )
        $template = locate_template( 'category-1.php' );
    return $template;
}
add_filter( 'category_template', 'wpd_subcategory_template' );

I get the posts of child category ok, but the post in parent category not show full ( current 10 posts ). Has anyone tell me why ? Thank you.

Answer 1

This if statement is preventing you to use category-1.php template for the parent categories:

if( 0 < $cat->category_parent )

Parent (top level) categories always have a $cat->category_parent === 0. Remove that statement and try again, to see if this is the result you want to achieve.

Other than that, I am not really sure I understood you well. If you are wondering why not all of your posts are displayed on your template, know that by default, posts_per_page on global queries is limited to what is set in your Settings > Reading > Blog pages show at most in the dashboard.