Display posts with 'Product' type ordered by 'Price' custom field:
$query = new WP_Query(
array ( 'post_type' => 'product',
'orderby' => 'meta_value',
'meta_key' => 'price' )
);
Which code should I use if also want to order by 'Size'?
Another example on which I need multiple sort on custom fields:
Display posts with 'Event' type ordered by 'Start_Hour' and then by 'Start_Minute'.
Thanks to Bainternet I found the solution:
function orderbyreplace($orderby) {
return str_replace('menu_order', 'mt1.meta_value, mt2.meta_value', $orderby);
}
and...
$args = array(
'post_type'=>'Events',
'orderby' => 'menu_order',
'order' => 'ASC',
'meta_query' => array(
array(
'key' => 'Start_Hour',
'value' => '',
'compare' => 'LIKE'
),
array(
'key' => 'Start_Minute',
'value' => '',
'compare' => 'LIKE'
)
)
);
add_filter('posts_orderby','orderbyreplace');
$loop = new WP_Query( $args );
remove_filter('posts_orderby','orderbyreplace');