How do I query a custom post type with a custom taxonomy?

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For some reason I’m finding it a struggle to grab any posts using a custom taxonomy… can anyone unravel my stupidity?

$args = array(
    'post_type' => 'adverts',
    'advert_tag' => 'politics' // Doesn't seem to work.
);

query_posts($args); 

while ( have_posts() ) : the_post();
    //Show Posts
endwhile;

Taxonomy Declaration:

add_action( 'init', 'add_custom_taxonomy', 0 );
function add_custom_taxonomy() {
    register_taxonomy('advert_tag', 'Adverts', 
        array(
            'hierarchical' => true,
            'labels' => array(
            'name' => _x( 'Advert Tags', 'taxonomy general name' ),
            'singular_name' => _x( 'Advert Tag', 'taxonomy singular name' ),
            'search_items' =>  __( 'Search Advert Tags' ),
            'all_items' => __( 'All Advert Tags' ),
            'parent_item' => __( 'Parent Advert Tag' ),
            'parent_item_colon' => __( 'Parent Advert Tag:' ),
            'edit_item' => __( 'Edit Advert Tag' ),
            'update_item' => __( 'Update Advert Tag' ),
            'add_new_item' => __( 'Add New Advert Tag' ),
            'new_item_name' => __( 'New Advert Tag Name' ),
            'menu_name' => __( 'Advert Tags' ),
        ),
        'rewrite' => array(
            'slug' => 'advert-tags',
            'with_front' => false,
            'hierarchical' => true
        ),
    );
}

Custom Post Type Declaration:

add_action( 'init', 'create_post_type' );
function create_post_type() {
    register_post_type( 'Adverts',
        array(
            'labels' => array(
                'name' => __( 'Adverts' ),
                'singular_name' => __( 'Advert'),
                'add_new' => __( 'Add New' ),
                'add_new_item' => __( 'Add a New Advert' ),
                'edit' => __( 'Edit' ),
                'edit_item' => __( 'Edit Advert' ),
                'new_item' => __( 'New Advert' ),
                'view' => __( 'View' ),
                'view_item' => __( 'View Advert' ),
                'search_items' => __( 'Search Adverts' ),
                'not_found' => __( 'No Adverts found' ),
                'not_found_in_trash' => __( 'No Adverts found in Trash' ),
            ),
            'supports' => array(
                'title',
                'thumbnail',
            ),
            'has_archive' => true,
            'menu_position' => 10,
            'public' => true,
            'rewrite' => array( 
                'slug' => 'adverts' 
            ),
            'taxonomies' => array('advert_tag')
        )
    );
}

5

Firs of all don’t use query_posts() ever, read more about it here: When should you use WP_Query vs query_posts() vs get_posts()?.

You have to use WP_Query to fetch posts what you need. Read documentation for it. In your case the query could be like this:

$the_query = new WP_Query( array(
    'post_type' => 'Adverts',
    'tax_query' => array(
        array (
            'taxonomy' => 'advert_tag',
            'field' => 'slug',
            'terms' => 'politics',
        )
    ),
) );

while ( $the_query->have_posts() ) :
    $the_query->the_post();
    // Show Posts ...
endwhile;

/* Restore original Post Data 
 * NB: Because we are using new WP_Query we aren't stomping on the 
 * original $wp_query and it does not need to be reset.
*/
wp_reset_postdata();

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