Have you tried hard-coding the category parameter for testing, and additionally trying different methods to set the query parameters..
Eg.
query_posts( array( 'category_name' => 'myname', 'meta_ke' => 'wpfp_favorites', 'orderby' => 'meta_value_num' ) );
query_posts( array( 'cat' => N, 'meta_key' => 'wpfp_favorites', 'orderby' => 'meta_value_num' ) );
query_posts( array( 'cat__in' => array( N ), 'meta_key' => 'wpfp_favorites', 'orderby' => 'meta_value_num' ) );
Where N would be a numerical ID number for the category.
Logically the query class should accept both a category and a meta key, whilst being able to order by meta key, i can’t see any conditional logic that would prevent these two parameters working alongside one another..
Maybe an additional test would be to set the meta_value
parameter to and see if this has an effect, you could use something like this to avoid the need to match a particular value.. (which would match any post with that custom field key where the value isn’t an empty string)
query_posts( array(
'cat' => N,
'meta_key' => 'wpfp_favorites',
'meta_value' => '',
'meta_compare' => '!=',
'orderby' => 'meta_value_num'
) );
RE: Get category ID…. get_cat_ID(‘nameofcat’) or alternatively take a peek at the edit URL for the category in the administration area it should contain the category ID..
🙂