按自定义字段对自定义帖子类型进行排序

Question

How can you sort a custom post type by a custom field in Wordpress? I'm trying to figure out a way to echo a custom field called 'State' alphabetically and place the custom post type links called employees under each of their respect states.

So it would look like this:

Alabama

• Appleseed, Johnny
• Chamber, Pete

Florida

• Miller, Sam

• Stark, Amy

  I know how to write the basic loop for a custom post type but I'm not sure how to sort under a custom field belonging to that post type alphabetically.

   <?php $query = new WP_query ( array( 'post_type'=> 'employees', 'meta_key'=> 'state', 'orderby'=> 'meta_value', 'order' => 'DESC')); while ( $query -> have_posts() ) : $query -> the_post(); ?> <?php echo get_post_meta($post->ID, 'state', true); ?> <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2> <?php endwhile; wp_reset_query(); ?> 

Answer 1

You could do something like this:

<?php $query = new WP_query ( array( 'post_type'=> 'employees', 'meta_key'=> 'state', 'orderby'=> 'meta_value', 'order' => 'DESC'));
  while ( $query -> have_posts() ) : $query -> the_post(); ?>
    <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
  <?php
endwhile;   
wp_reset_query();  ?>

Answer 2

Finally got it thanks to this link: http://pastebin.com/b4WGrMhD

<?php $employeesQuery = new WP_Query(array('post_type' => 'employees', 'meta_key' => 'state', 'orderby' => 'meta_value', 'order' => 'ASC', 'posts_per_page' => '-1')); ?>
  <?php $prevltr = ""; ?>
    <?php if(have_posts()) { while ( $employeesQuery->have_posts() ) { $employeesQuery->the_post(); ?>
            <?php $state = get_post_meta($post->ID, 'state', true); ?>
            <?php $curltr = $state; ?>
            <?php if($curltr != $prevltr) : ?>
                <a name="section-<?php echo $curltr ?>"></a><br class="clear" /><h4><?php echo $curltr; $prevltr = $curltr; ?></h4>
            <?php endif; ?>

            <article class="employee-entry" id="entry-<?php the_title_attribute(); ?>">

                <div><strong><a href="<?php the_permalink() ?>" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a></strong></div>
                <div><?php $terms = get_the_terms( $post->ID , 'titles' ); foreach( $terms as $term ) { print $term->name; unset($term); } ?></div>

            </article>

<?php }} ?>