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I'm trying to filter the query on a sub page called "Ask Question" to list all of the recent questions submitted by users, but I get a 404 when going to the page. Flushing the permalink structure did not fix the issue. It is currently set to Month and Name.

Creating a new question works properly and I'm able to access the new posts. The custom taxonomies work correctly as well, however the archive pages do not.

This is the code that I'm using.

Post type

function question_post_type() {
    $labels = array(
        'name'                => _x( 'Questions', 'Post Type General Name', 'text_domain' ),
        'singular_name'       => _x( 'Question', 'Post Type Singular Name', 'text_domain' ),
        'menu_name'           => __( 'Questions', 'text_domain' ),
        'parent_item_colon'   => __( 'Parent Question:', 'text_domain' ),
        'all_items'           => __( 'All Questions', 'text_domain' ),
        'view_item'           => __( 'View Question', 'text_domain' ),
        'add_new_item'        => __( 'Add New Question', 'text_domain' ),
        'add_new'             => __( 'New Question', 'text_domain' ),
        'edit_item'           => __( 'Edit Question', 'text_domain' ),
        'update_item'         => __( 'Update Question', 'text_domain' ),
        'search_items'        => __( 'Search questions', 'text_domain' ),
        'not_found'           => __( 'No questions found', 'text_domain' ),
        'not_found_in_trash'  => __( 'No questions found in Trash', 'text_domain' ),

    $rewrite = array(
        'slug'                => '/ask/question',
        'with_front'          => true,
        'pages'               => true,
        'feeds'               => true,

    $args = array(
        'label'               => __( 'question', 'text_domain' ),
        'description'         => __( 'Question', 'text_domain' ),
        'labels'              => $labels,
        'supports'            => array( 'title', 'editor', 'author', 'comments', 'revisions', 'custom-fields', 'page-attributes', ),
        'hierarchical'        => false,
        'public'              => true,
        'show_ui'             => true,
        'show_in_menu'        => true,
        'show_in_nav_menus'   => true,
        'show_in_admin_bar'   => true,
        'menu_position'       => 20,
        'can_export'          => true,
        'has_archive'         => true,
        'exclude_from_search' => false,
        'publicly_queryable'  => true,
        'rewrite'             => $rewrite,
        'capability_type'     => 'post',

    register_post_type( 'question', $args );

add_action( 'init', 'question_post_type', 0 );


if ( ! function_exists('custom_question_taxonomy') ) {

    // Register Custom Taxonomy
    function custom_question_taxonomy()  {
        $labels = array(

            => _x( 'Question Types', 'Taxonomy General Name', 'text_domain' ),
        'singular_name'              => _x( 'Question Type', 'Taxonomy Singular Name', 'text_domain' ),
        'menu_name'                  => __( 'Question Type', 'text_domain' ),
        'all_items'                  => __( 'All Question Types', 'text_domain' ),
        'parent_item'                => __( 'Parent Question Type', 'text_domain' ),
        'parent_item_colon'          => __( 'Parent Question Type:', 'text_domain' ),
        'new_item_name'              => __( 'New Question Type', 'text_domain' ),
        'add_new_item'               => __( 'Add Question Type', 'text_domain' ),
        'edit_item'                  => __( 'Edit Question Type', 'text_domain' ),
        'update_item'                => __( 'Update Question Type', 'text_domain' ),
        'separate_items_with_commas' => __( 'Separate Question Types with commas', 'text_domain' ),
        'search_items'               => __( 'Search Question Type', 'text_domain' ),
        'add_or_remove_items'        => __( 'Add or remove Question Types', 'text_domain' ),
        'choose_from_most_used'      => __( 'Choose from the most used Question Types', 'text_domain' ),

    $rewrite = array(
        'slug'                       => 'question-type',
        'with_front'                 => false,
        'hierarchical'               => true,

    $args = array(
        'labels'                     => $labels,
        'hierarchical'               => true,
        'public'                     => true,
        'show_ui'                    => true,
        'show_admin_column'          => true,
        'show_in_nav_menus'          => true,
        'show_tagcloud'              => true,
        'rewrite'                    => $rewrite,

    register_taxonomy( 'question-type', 'question', $args );

    add_action( 'init', 'custom_question_taxonomy', 0 );



function question_posts_query( $query ) {

    if ( $query->is_post_type_archive( 'question' ) || $query->is_page(3001) && $query->is_main_query() ) {
        $query->set( 'post_type', 'question' );
    return $query;
add_filter( 'pre_get_posts', 'question_posts_query' );

My page loop

<?php if (have_posts()) :
    while (have_posts() ) : the_post(); ?>

    <div class="entry">
        <div class="post-content">

          <?php the_content(__('Read More &raquo;', 'gp_lang')); ?>

          <?php the_terms( $post->ID, 'question-type', '<div class="category"><span>Category: </span>', '', '</div>' ); ?>

    <?php endwhile; ?>
<?php endif; ?>
share|improve this question
Do the pages resolve without the filter being applied? Do you get a 404 on both the custom post type's archive index page and static page ID 3001? (Note: watch your Boolean conditions. You've got an AND in series with an OR. I would suggesting putting the OR conditionals in parentheses. – Chip Bennett Feb 18 '13 at 20:18
@ChipBennett Yes, the page resolves without the filter. I do get a 404 on the post type archive page. – Matt Av Feb 18 '13 at 21:06

Changing a query for the page post type via pre_get_posts is a bit tricky, and maybe not worth the potential issues involved. If you inspect the generated SQL, it's looking for your requested pagename in the question post type, which is why you get the 404.

The solution is to delete the page, so WordPress will load a post type archive by default, or keep the page and use WP_Query within the template to load the custom posts.

share|improve this answer
Using wp_query on the page does work, though its not the best solution in the long run for dynamically displaying content with flexibility. The archive not working is still a problem. – Matt Av Feb 19 '13 at 15:56
why do you have a page where you want a post type archive? maybe I misunderstand what you're trying to do, the path of your page and how it relates to your post type archive isn't clear to me. – Milo Feb 19 '13 at 16:02
The Ask page displays a list of questions submitted by the user along with a submission form. Its designed as a Q/A. I want to use the default archive for the question post type to give users access to the older questions (answered or not) listed by the month and year. – Matt Av Feb 19 '13 at 17:37
for the default post type archive, change your slug to 'ask/question' without the leading slash. as I mention in my answer, the pre_get_posts filter to load posts on the page post type will never work quite right, though I don't understand why WP_Query wouldn't work for you in this case, perhaps you could elaborate on that. – Milo Feb 19 '13 at 19:10

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