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Sometimes I want to access one particular CPT to extract something from it, for example a custom field value:

$group = new WP_Query( array( 
    'post_type' => 'group',
    'p' => $group_id
) );
while ( $group->have_posts() ) : $group->the_post();
    $group_type = get_post_meta($post->ID, "group_type", $single = true);       
endwhile;

However the purpose of a loop is to access more than one element so I dislike using a loop for a single post. Is there a way to do exactly the same thing (accessing this custom field value) without using a loop?

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3 Answers

up vote 1 down vote accepted

how about get_post?

$post       = get_post( $p );
$group_type = get_post_meta( $post->ID, 'group_type', true );
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Your WP_Query object holds an array of posts. Just take first entry:

get_post_meta( $group->posts[0]->ID, "group_type", true );

Note: the third parameter for get_post_meta() expects a keyword: true or false, not $single = true. It works, but it looks rather odd. :)

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You can use only half of a loop. Well, it's not even a loop, just the check if we received any post. Simply use the (WP_Query) objects methods. The example wraps it up in a function, so you could even use it as Template Tag:

function wpse83212_get_group_post( $group_id )
{
    add_filter( 'post_limits', 'wpse83212_group_post_limit' );
    $group = new WP_Query( array( 
         'post_type' => 'group'
        ,'p'         => $group_id
    ) );
    // Did the query return anything?
    if ( $group->have_posts() )
    {
        // Setup the post data
        $group->the_post();
        // Now we have access to the `$GLOBALS['post']` object
        // as well as to any functions that only work inside the Loop:
        return get_post_meta( get_the_ID(), 'group_type', true );
    }
    else
    {
        return NULL;
    }
}
function wpse83212_group_post_limit( $limit )
{
    remove_filter( current_filter(), __FUNCTION__, 10 );
    return 1;
}

Then simply use it in any template: $group_meta = wpse83212_get_group_post( 12 );. If the value now is NULL there was no such post. Else you'd get the single value returned.

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1  
And perhaps also add 'posts_per_page' => 1 as argument to WP_Query, since OP only wants one post. –  webaware Jan 26 '13 at 13:33
    
@webaware Good idea. But this will influence the per page limit only. I added an action for the post_limits filter. –  kaiser Jan 26 '13 at 15:16
    
Won't 'posts_per_page' => 1 do the same thing in effect, by returning only a single 'page' of 1 row from MySQL? –  webaware Jan 26 '13 at 22:53
    
Afaik this depends on what page you're on, so it could be ... faulty. –  kaiser Jan 26 '13 at 23:31
    
Would specifying 'page_id' => 1 overcome that? –  webaware Jan 27 '13 at 0:26
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