Add custom post type to index and search results

wpcampus-functionality.php

<?php
/**
 * Include Lecture post type in the main and search queries
 */
function wpcampuscpt_query_filter( $query ) {
    if ( !is_admin() && $query->is_main_query() ) {
		if ( $query->is_search() || $query->is_home() ) {
			$query->set('post_type', array( 'post', 'lecture' ) );
	    }
    }
}
add_action( 'pre_get_posts', 'wpcampuscpt_query_filter' );