[wp-trac] [WordPress Trac] #16088: Excluding child category posts using pre_get_posts action hook not working

[WordPress Trac]

#16088: Excluding child category posts using pre_get_posts action hook not working
--------------------------+-----------------------------
 Reporter:  jflagarde     |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Query         |    Version:  3.1
 Severity:  normal        |   Keywords:
--------------------------+-----------------------------
 Hello,

 I have a similar problem to Ticket #15161. I'm not able to filter out the
 posts from a category using pre_get_posts.

 I have a site which has the following structure:
 * parentcat1
   * subcat1
   * subcat2

 On parentcat1 page, I would like to show only the parentcat1 posts, not
 its child posts from subcat1 and subcat2.

 Initially, I had implemented some code in taxonomy-category.php like:
 {{{
 $args = array(
         'category__in' => array($parentcat_id)
 );
 $my_query = new WP_query();
 $my_query->query($args);

 while ($my_query->have_posts()) {
         $my_query->the_post();
 }}}

 I'm actually converting my theme to a parent/child theme structure with
 action and filter hooks. I tried the following code on WP3.0.3, WP3.0.4,
 on the Changesets: r16380 (suggested in Ticket #15161) and on the lastest
 svn build Changesets: r17206.

 {{{
 function jfl_exclude_child_posts($query) {
         if ( $query->is_category ) {
                 $query->set('category__in', $parentcat_id);
         }
         return $query;
 }
 add_action('pre_get_posts', 'jfl_exclude_child_posts');
 }}}

 With the code above, the posts from the child categories are still
 present.

 After hours of trial and error, I managed to find that temporary solution:

 {{{
 function jfl_exclude_child_posts2($query) {
         if ( $query->is_category ) {
                 $query->set('category__in', $parentcat_id);
                 $query->set('category__not_in', $subcat_ids) );
         }
         return $query;
 }
 add_action('pre_get_posts', 'jfl_exclude_child_posts2');
 }}}

 I would love to help to find the solution and modify the query.php file. I
 tried a few things, but I'm really not that experimented with programming.
 Any idea how to resolve this?

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Ticket URL: <http://core.trac.wordpress.org/ticket/16088>
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