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I can do something like the following with a standard category:

$query->set('category__not_in', $term_id);

But how do I do the same with a custom taxonomy term?

I'm using Wordpress 3.3.1 if it is relevant. Thank you. :)

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Just a guess - perhaps I'm supposed to use something like '<custom taxonomy name>__not_in' instead? –  rinogo Jan 18 '12 at 0:13
    
possible duplicate of And/Or Category Query –  kaiser Jan 18 '12 at 1:11
    
Just search for tax_query if you want to build a new query. If you want to modify one, then re-build your initial query to use tax_query, then add a filter to posts_clauses and dump $pieces. Then just copy/paste your initial query from the dump, move it to the filter and use the default query (altered via the filter). This saves you a query per request as WP is doing one per default and every custom query is a new one. –  kaiser Jan 18 '12 at 1:13
    
The problem is that I'm not the one who built the query. I'm trying to exclude a custom category from a particular query, intercepted via pre_get_posts(). So, I didn't build the query, and I can't build it from scratch. :P Ideas? –  rinogo Jan 18 '12 at 1:17
    
"I'm not the one who built the query" ... What?! Do you have access to changing files or not? –  kaiser Jan 18 '12 at 2:28
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1 Answer

up vote 0 down vote accepted

For what it's worth, I just gave up on the '__not_in' approach and went with the following somewhat sneaky solution:

//Create the exclusion rule
$new_tax_query = array(
    array(
        'taxonomy' => 'x_category',
        'field'    => 'slug',
        'terms'    => array('y-slug'),
        'operator' => 'NOT IN',
    )
);

//If there is already a tax_query, 'AND' our new rule with the entire existing rule.
$tax_query = $query->get('tax_query');
if(!empty($tax_query)) {
    $new_tax_query = array(
        'relation' => 'AND',
        $tax_query,
        $new_tax_query
    );              
}

// var_dump($new_tax_query);

$query->set('tax_query', $new_tax_query);
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$tax_query is an object that contains a nested array. You can't override the object with a nested array. –  AlxVallejo Apr 17 '13 at 19:07
    
NOTE! AlxVallejo is wrong. $tax_query is not an object, $query is though (it's an instance of WP_Query): wordpress.stackexchange.com/questions/35196/… –  its_me Nov 21 '13 at 19:17
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