if searching by name, include all posts by that person

functions.php

@@ -13,20 +13,6 @@ function my_search_query( $query ) {
 }
 add_action( 'pre_get_posts', 'my_search_query' );
 
-//
-// Order search results by post_title
-//
-function my_search_query( $query ) {
-	// not an admin page and is the main query
-	if ( !is_admin() && $query->is_main_query() ) {
-		if ( is_search() ) {
-			$query->set( 'orderby', 'post_title' );
-			$query->set( 'order', 'ASC' );
-		}
-	}
-}
-add_action( 'pre_get_posts', 'my_search_query' );
-
 function neag_scripts() {
 	wp_enqueue_style( 'neag-style', get_stylesheet_directory_uri() . '/css/neag.css');
 	wp_enqueue_script('neag-custom', get_stylesheet_directory_uri().'/js/custom.js', array('jquery', 'cs'));
@@ -195,5 +181,50 @@ if(function_exists("register_field_group"))
 		'menu_order' => 0,
 	));
 }
-
+//==================================================
+// include authors in search results
+//==================================================
+/**
+ * Include posts from authors in the search results where
+ * either their display name or user login matches the query string
+ *
+ * @author danielbachhuber
+ */
+add_filter( 'posts_search', 'db_filter_authors_search' );
+function db_filter_authors_search( $posts_search ) {
+	// Don't modify the query at all if we're not on the search template
+	// or if the LIKE is empty
+	if ( !is_search() || empty( $posts_search ) )
+		return $posts_search;
+	global $wpdb;
+	// Get all of the users of the blog and see if the search query matches either
+	// the display name or the user login
+	add_filter( 'pre_user_query', 'db_filter_user_query' );
+	$search = sanitize_text_field( get_query_var( 's' ) );
+	$args = array(
+		'count_total' => false,
+		'search' => sprintf( '*%s*', $search ),
+		'search_fields' => array(
+			'display_name',
+			'user_login',
+		),
+		'fields' => 'ID',
+	);
+	$matching_users = get_users( $args );
+	remove_filter( 'pre_user_query', 'db_filter_user_query' );
+	// Don't modify the query if there aren't any matching users
+	if ( empty( $matching_users ) )
+		return $posts_search;
+	// Take a slightly different approach than core where we want all of the posts from these authors
+	$posts_search = str_replace( ')))', ")) OR ( {$wpdb->posts}.post_author IN (" . implode( ',', array_map( 'absint', $matching_users ) ) . ")))", $posts_search );
+	return $posts_search;
+}
+/**
+ * Modify get_users() to search display_name instead of user_nicename
+ */
+function db_filter_user_query( &$user_query ) {
+	if ( is_object( $user_query ) )
+		$user_query->query_where = str_replace( "user_nicename LIKE", "display_name LIKE", $user_query->query_where );
+	return $user_query;
+}
 ?>