WordPress :: Divi Builder :: Search Module :: Custom Post Types

child-theme-functions.php

<?php

function my_remove_default_et_pb_custom_search() {
	remove_action( 'pre_get_posts', 'et_pb_custom_search' );
	add_action( 'pre_get_posts', 'my_et_pb_custom_search' );
}
add_action( 'wp_loaded', 'my_remove_default_et_pb_custom_search' );

function my_et_pb_custom_search( $query = false ) {
	if ( is_admin() || ! is_a( $query, 'WP_Query' ) || ! $query->is_search ) {
		return;
	}
	if ( isset( $_GET['et_pb_searchform_submit'] ) ) {
		$postTypes = array();
		if ( ! isset($_GET['et_pb_include_posts'] ) && ! isset( $_GET['et_pb_include_pages'] ) ) $postTypes = array( 'post' );
		if ( isset( $_GET['et_pb_include_pages'] ) ) $postTypes = array( 'page' );
		if ( isset( $_GET['et_pb_include_posts'] ) ) $postTypes[] = 'post';
		
		/* BEGIN Add custom post types */
		$postTypes[] = 'product';
		/* END Add custom post types */
		
		$query->set( 'post_type', $postTypes );
		if ( ! empty( $_GET['et_pb_search_cat'] ) ) {
			$categories_array = explode( ',', $_GET['et_pb_search_cat'] );
			$query->set( 'category__not_in', $categories_array );
		}
		if ( isset( $_GET['et-posts-count'] ) ) {
			$query->set( 'posts_per_page', (int) $_GET['et-posts-count'] );
		}
	}
}

A child theme is required to properly implement this customization. If you are not currently using a child theme, you can download one using the following link:

https://www.dropbox.com/s/ut4dkjq5n7j9nkz/divi-child-theme-0.1.1.r20.zip?dl=1

Add the code snippet above to your child theme's functions.php. Add your desired CPTs where it says /* BEGIN Add custom post types */

works well,

thank you

Works well, but it broke my mega-menu (on the search result page)
https://wordpress.stackexchange.com/questions/52522/adding-meta-key-via-pre-get-posts-causes-navigation-to-disappear

I changed line 10 to include a check for $query->is_main_query():

if ( is_admin() || ! is_a( $query, 'WP_Query' ) || ! $query->is_main_query() || ! is_search() ) {

Cool! Thank you very much as it worked for me. Although it doesn't search in the custom fields data. Do you know how to make it able for searching within custom fields?.

////// UPDATE

I've found this very useful explanation and snippet code for achieving what i've requested: http://adambalee.com/search-wordpress-by-custom-fields-without-a-plugin/