telfia

As for me, it’s better to use plugin for such kind of search. The Search Everything plugin have options for searching custom fields and does it perfectly for my site.

In other hand you could find usefull this discuss.

Amazing. Now it works directly from functions.php. I removed some plugins last week. Setting the priority might be useful for you.

function filter_search($query) {
    if ($query->is_search) {
    $query->set('post_type', array('page','post'));
    };
    return $query;
};
add_filter('pre_get_posts', 'filter_search', 999);

The next code works for me:

<?php get_header(); ?>
<section id="mainContent" class="cf">
	<article id="editorial" class="cf search-results">
        add_filter('pre_get_posts','filter_search');
        get_posts();
        <?php if (have_posts()) : ?>
// the rest of code

What function do you use for getting posts?

What code did you put to the template?

You should put this part of code

add_filter('pre_get_posts', 'filter_search');

into the layout template. For example, to index.php.

if (is_search()) :
  add_filter('pre_get_posts','SearchFilter');
  get_posts();
else :
  /* the usual way of retrieving posts */