How to only show posts on last child category

by

By default WordPress will list posts on each category in its hierarchy.

Example:

Parent

/- child

/– grandchild

When viewing the “Parent” category you will see a list of posts from child, grandchild and parent – even if the post is just ticked in “Grandchild”.

My question is: How do I only show posts when viewing the last child? Is there a built in WordPress function for this?

e.g.: 

[grandchild categories] = array of grandchildren

if(in_array( [grandchild categories] )) : show posts

else:

do nothing

2 Answers
2

There is of course the include_children parameter for WP_Query as part of the taxonomy parameters. Which I suppose should work like this for you:

$args = array(
    'tax_query' => array(
        array(
            'include_children' => false
        ),
    ),
);
$query = new WP_Query( $args );

Or via parse_tax_query for your category archive:

add_filter( 
    'parse_tax_query', 
    'wpse163572_do_not_include_children_in_category_archive_parse_tax_query' 
);
function wpse163572_do_not_include_children_in_category_archive_parse_tax_query( $query ) {
    if ( 
        ! is_admin() 
        && $query->is_main_query()
        && $query->is_category()
    ) {
        // as seen here: http://wordpress.stackexchange.com/a/140952/22534
        $query->tax_query->queries[0]['include_children'] = 0;
    }
}

Note: Thanks to @PieterGoosen this is now tested and confirmed working.

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