pre-get-posts

You are using pre_get_posts incorrectly. You should not be returning anything at all And you should be manipulating the query object that is passed into the filter and not modifying the globals at all. For example: function modify_onthisday_cat( $query ) { if ($query->is_category(7) && $query->is_main_query() ) { global $post; // not going to be set … Read more

You’ve got a typo there, should be: is_admin(). You should enable debugging by setting define(‘WP_DEBUG’, true); in wp-config.php to see such errors. Also there’s no need of returning anything in action hook. add_action( ‘pre_get_posts’,’filter_archive’, 1 ); function filter_archive( $query ) { if ( ! is_admin() && is_category(’76’) && $query->is_main_query() ) $query->set(‘posts_per_page’, ’12’); } Sidenote: personally … Read more

Remove the action before you run the internal query, and always verify main query with is_main_query: function custom_loops($query) { if ( $query->is_tax( ‘service_photo_location’ ) && $query->is_main_query() ){ remove_action( ‘pre_get_posts’, ‘custom_loops’ ); $ids = get_nearby_partners_by_area(50000, ‘service_photo’); // … } } add_action(‘pre_get_posts’, ‘custom_loops’);

The logic inside the is_home function relies on the main query, but by definition that query hasn’t happened yet as you’re still in the pre_get_posts filter. Instead, consider $q->is_home(). The same goes for is_feed() $q->is_feed()

Try this: EDIT: added short circuit return statements to avoid running unnecessary code on admin pages or other queries (e.g. nav menu items) // Custom query for research sub-categories function custom_query_for_research_subcategories($query) { if (is_admin() || !$query->is_main_query()) { return $query; } $qobj = get_queried_object(); if (isset($qobj->taxonomy) && ‘category’ == $qobj->taxonomy ) { $term = get_term($qobj->term_id); if … Read more

The posts_request filter actually takes a second argument, which is the query. You can check if that query is the main query. Try this: add_filter( ‘posts_request’, ‘my_request_filter’, 10, 2 ); function my_request_filter($sql, $query) { if($query->is_main_query() && is_search()) { $sql=”some custom sql query” } return $sql; }