Reply To: filter relationship query – exclude if a certain category

• John Huebner

• April 5, 2021 at 2:55 am

If I understand you want to include posts that are in 2 categories but exclude them if they are also in a third category.

I.E. Show if in category 76 but not if it is also in category 78.

I think that in order to do this you need to use a tax_query. I could be wrong but I do not think the ‘cat’ argument can be used the way you are trying to use it and I also thing that using ‘category__in’ combined with ‘category__not_in’ will work the same way. Like I said, I could be wrong but I think these arguments work as ‘OR’ (meaning category 76 OR not category 78).

$args['tax_query'] = array(
  'relation' => 'AND',
  array(
    'taxonomy' => 'category',
    'field' => 'term_id'
    'terms' => array(76, 77),
    'operator' => 'IN'
  ),
  array(
    'taxonomy' => 'category',
    'field' => 'term_id'
    'terms' => array(78),
    'operator' => 'NOT IN'
  )
);