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John, thank you for your help, i figured out what the problem was, after I used your meta_query code, it didn’t work, but then I started to do a bit more research, and it turns out the problem was in the $value var.
I changed
$value = explode(',', $_GET[ $name ]);
to $value = $_GET[ $name ]
and it worked flawlessly.
To help anyone else, my whole code was:
function lang_pre_get_posts( $query ) {
// array of filters (field key => field name)
$GLOBALS['my_query_filters'] = array(
'field_1' => 'event_country'
);
// bail early if is in admin
if( is_admin() ) {
return;
}
// get meta query
$meta_query = $query->get('meta_query');
// loop over filters
foreach( $GLOBALS['my_query_filters'] as $key => $name ) {
// continue if not found in url
if( empty($_GET[ $name ]) ) {
continue;
}
if( ! $query->is_post_type_archive() ) return;
// get the value for this filter
$value = $_GET[ $name ];
// append meta query
$meta_query[] = array(
'relation' => 'OR',
array(
'key' => 'event_country',
'value' => '"'.$value.'"',
'compare' => 'IN'
),
array(
'key' => 'event_country',
'value' => '"'.$value.'"',
'compare' => 'LIKE'
),
);
}
// update meta query
$query->set('meta_query', $meta_query);
}
add_action('pre_get_posts', 'lang_pre_get_posts', 10, 1);
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