Filter all queries with a specific taxonomy

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Is there any way to filter all post queries and add a specific taxonomy? Case in point, I have a taxonomy object of “Region” with terms like “Global”, “Americas”, “Europe”, etc. (Users designate their region in their user profile through custom fields which is stored as a usermeta value and added the user cache object.)

The idea being that as the signed-in user navigates the site, they’d only see content designated within their region. Obviously I could write a custom query per page to include their region, but I was wondering if there was a way to tap into the query object and add the taxonomy requirement regardless of what the query was for (e.g, post, custom post type, archive page, etc.).

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Any help would be much appreciated! Thanks.

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  1. Below code is an example that does what you want. See tax_query for more information.

    function my_get_posts( $query ) {
    // we only need to modify the query for logged in users
    if ( !is_user_logged_in() ) return $query;
    $current_user = wp_get_current_user();
    // assuming that user's region is stored as user_region meta key
    $user_region = get_user_meta( $current_user->ID, 'user_region', true );
    $query->set( 'tax_query', array(
        array(
            'taxonomy' => 'region',
            'field' =>  'slug',
            'terms' => $user_region
        )
    ));
    return $query;
}
add_filter( 'pre_get_posts', 'my_get_posts' );