How do you Query posts with nothing in common?

Question

We can get multiple posts manually in a page, but that's generated in a template, AFTER the default query returned something else (page/post, etc)

How do you query multiple posts in a public query, which share no taxonomy or anything else?

e.g. by ID:

http://example.com/?p=23,18,2,199,6,8

I got it working already parsing a variable in a page-name.php template, but once it gets the template it's too late to generate e.g. canonicals.

I guess this would be something similar to a search, except the search is a 1-to-multiple-posts relation and this requires a multiple-queries-to-unique-post (each).

Thanks.

Answer 1

Maybe you're looking for the post__in parameter in WP_Query.

$query = new WP_Query(array(
    'post__in' => array(23,18,2,199,6,8)
);

And then:

while ( $query->have_posts() ) {
    $query->the_post();
    /* post loop */
}

Take a look at the docs. =D

For public queries:

post__in is not public queryable by default, so you can just validate and copy $_GET['post__in'] on the parse_query action hook, and let the thing happen.

add_action('parse_query', 'wpse59828_parse_query');
function wpse59828_parse_query($query) {
    if (empty($_GET['post__in']))
        return $query;

    $posts = explode(',', $_GET['post__in']);
    $post__in = array();
    foreach ($posts as $p) {
        $post__in[] = intval($p);
    }

    $query->query_vars['post__in'] = $post__in;
    return $query;
}

Then you would just access this:

http://mywebsite.com/?post__in=23,18,2,199,6,8

Please note that, like this, you won't be able to set the post order in WordPress versions before 3.5 (#13729). Use this plugin if you need to.

Answer 2

$tax_query = array (
    array (
        'taxonomy' => 'product_cat',
        'field' => 'slug',
        'terms' => $cat_name
        )
    );

$args = array( 'tax_query' => $tax_query, 'numberposts' => -1);
$lastposts = get_posts( $args );