Woocommerce exclude specific category products from related products

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I’m trying to exclude products from two specific categories from showing up in the related products on the content single products page. The closest idea I have stumbled upon is this code from http://docs.woothemes.com/document/exclude-a-category-from-the-shop-page/. Any idea how to modify it for related products and NOT for the shop page? 

add_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

function custom_pre_get_posts_query( $q ) {

if ( ! $q->is_main_query() ) return;
if ( ! $q->is_post_type_archive() ) return;

if ( ! is_admin() && is_shop() ) {

    $q->set( 'tax_query', array(array(
        'taxonomy' => 'product_cat',
        'field' => 'slug',
        'terms' => array( 'knives' ), // Don't display products in the knives category on the shop page
        'operator' => 'NOT IN'
    )));

}

remove_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

}

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2 comments

  1. Old question, but ranks high in Google. Here’s a solution that works with today’s Woocommerce.

    Add this to your functions.php or custom plugin.

    function exclude_brands_from_related( $categories ){
    // array of category id's that should be excluded
    $exclude_cats = array( '100', '101', '102');

    foreach( $categories as $index => $cat ){
        if( in_array( $cat->term_id, $exclude_cats ) ){
            unset($categories[$index]);
        }
    }

    return $categories;
}

add_filter( 'woocommerce_get_related_product_cat_terms', 'exclude_brands_from_related' );

    And to do the same with tags:

    function exclude_tags_from_related( $tags ){
    // array of tags that should be excluded
    $exclude_tags = array( 'discontinued', 'whatever', 'even-more');

    foreach( $tags as $index => $tag ){
        if( in_array( $tag->slug, $exclude_tags ) ){
            unset($tags[$index]);
        }
    }

    return $tags;
}

add_filter( 'woocommerce_get_related_product_tag_terms', 'exclude_tags_from_related' );

  2. When developing with WooCommerce just look into plugin files. I found a file named related.phpin woocommercetemplatesingle-product : 

    $args = apply_filters('woocommerce_related_products_args', array(
'post_type'     => 'product',
'ignore_sticky_posts'   => 1,
'no_found_rows'     => 1,
'posts_per_page'    => $posts_per_page,
'orderby'       => $orderby,
'post__in'      => $related,
'post__not_in'      => array($product->id)
) );

    It’s a simple query so it will be easy to exclude what you want.

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