Wordpress loop for multiple custom post types

Question

I want to loop through 3 custom post types + posts and display the latest post from each.

This is what I have so far. This only takes the four most recent posts but not one only from each post type. Many thanks in advance

<?php $args = array(
      'post_type' =>.  array('post','mixes','artists','releases'),
      'posts_per_page' => '4',
        );

query_posts( $args );
while ( have_posts() ) : the_post(); ?>

  do stuff here         

<?php   endwhile; ?> 

Answer 1

That way won't work as you have found out it will grab just the 4 posts from the loop.

To do this you need to do a search of each post type, something like below will work:

$terms = array('post', 'mixes', 'artists', 'releases');
  if ( !empty( $terms ) && !is_wp_error( $terms ) ){
   foreach ( $terms as $term ) {
    $my_query = new WP_Query('posts_per_page=1&post_type='.$term);
    while ($my_query->have_posts()) : $my_query->the_post();
     echo '<h2>'.$term.'</h2>';
     echo '<ul>';
      echo '<li>'.get_the_title().'</li>';
     echo '</ul>';
    endwhile; wp_reset_query();
   }
  }

That should do the following:

Post Type 1 - post title

Post Type 2 - post title

Post Type 3 - post title

Post Type 4 - post title