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I'm using the pre_get_posts hook to order the main query on all my custom post type / taxonomy pages using a custom meta value. As part of the logic, I am trying to determine which taxonomy is currently being displayed by using get_query_var('taxonomy'), however no matter what I try, it keeps returning a blank string:

function sort_query($query)
    ...
    if (is_tax()){
        ...
        echo get_query_var('taxonomy'); // Empty
        echo get_query_var($query->query_vars['taxonomy']); // Empty
        ...
    }
}
add_action('pre_get_posts', 'sort_query');

Any help would be greatly appreciated; thanks!

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Are you sure is_tax is working and what you want to use? –  Wyck Jan 15 '13 at 17:41
    
@Wyck As far as I can tell based on limited testing it is working as expected; however I am open to alternatives. Basically need a way to capture the tax and apply different ordering based on it. –  dSquared Jan 15 '13 at 18:37
    
I am also struggling with a similar situation. Some plugin is executing query_posts() but when that query hits my pre_get_posts action, global $wp_query and $q parameter are different. get_query_var check $wp_query and returns empty. Looking at query_posts() source, it unsets and re-sets $wp_query, so how can $wp_query stay something old in my action? –  lkraav Jan 25 '13 at 18:52
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