How to get posts using category slug in ClassiPress?

Question

I'm using the ClassiPress theme as a base for a new theme. If you have worked with classipress, you should know that classipress handles its own category using the taxonomy ad_cat.
That said, I have a category named 7star and the following query to get the posts inside that category:

$the_query = new WP_Query( array('post_type'=>'ad_listing','category_name'=> '7star') );

Unfortunately this query does not work. It only fetches the posts withing categories that are of type category not ad_cat.
Anybody got any idea how to solve this?
I'm trying to avoid using manual sql query.

Answer 1

Well, I should have used the tax_query parameter. Something like the following:

$the_query = new WP_Query( array('post_type'=>'ad_listing',
'tax_query' => array(
    array(
        'taxonomy' => 'ad_cat',
        'field' => 'slug',
        'terms' => '7star'
    )
)
) );