In the page for a custom type, in administration , it lists the project title and date, so the search works only in these two fields.
How to make it look at custom fields at the time of the search? Which files do I need to modify? Which function should I use?
The solution is in this answer from WordPress Developers:
How to filter post listing (in WP dashboard posts listing) using a custom field (search functionality)?
First,youneedtoaddthedropdownandthetextinput,settingthePostTypeto$typenow:
/***AdicionarfiltrodeCustomFieldsnatela/wp-admin/edit.php*/add_action('restrict_manage_posts','ba_admin_posts_filter_restrict_manage_posts');functionba_admin_posts_filter_restrict_manage_posts(){global$wpdb,$typenow;if($typenow!=='post')//AJUSTESEUPOSTTYPEreturn;$sql='SELECTDISTINCTmeta_keyFROM'.$wpdb->postmeta.'ORDERBY1';$fields=$wpdb->get_results($sql,ARRAY_N);?><selectname="ADMIN_FILTER_FIELD_NAME">
<option value=""><?php _e('Filter By Custom Fields', 'baapf'); ?></option>
<?php
$current = isset( $_GET['ADMIN_FILTER_FIELD_NAME'] ) ? $_GET['ADMIN_FILTER_FIELD_NAME'] : '';
$current_v = isset( $_GET['ADMIN_FILTER_FIELD_VALUE'] ) ? $_GET['ADMIN_FILTER_FIELD_VALUE'] : '';
foreach ( $fields as $field )
{
# Hidden fields
if ( substr( $field[0], 0, 1 ) != "_" )
{
printf(
'<option value="%s"%s>%s</option>',
$field[0],
$field[0] == $current ? ' selected="selected"' : '',
$field[0]
);
}
}
?>
</select>
<?php _e('Value:', 'baapf'); ?>
<input type="TEXT" name="ADMIN_FILTER_FIELD_VALUE" value="<?php echo $current_v; ?>" />
<?php
}
Next, adding the filter when the search happens inside the page /wp-admin/edit.php and the $_GET correct is set:
/**
* Fazer a filtragem conforme o $_GET
*/
add_filter( 'parse_query', 'ba_admin_posts_filter' );
function ba_admin_posts_filter( $query )
{
global $pagenow;
$get_url = isset($_GET['ADMIN_FILTER_FIELD_NAME']) && $_GET['ADMIN_FILTER_FIELD_NAME'] != '';
if ( is_admin() && $pagenow=='edit.php' && $get_url )
{
$query->query_vars['meta_key'] = $_GET['ADMIN_FILTER_FIELD_NAME'];
if (isset($_GET['ADMIN_FILTER_FIELD_VALUE']) && $_GET['ADMIN_FILTER_FIELD_VALUE'] != '')
$query->query_vars['meta_value'] = $_GET['ADMIN_FILTER_FIELD_VALUE'];
}
}
Note that the search is literal by "Value" and that fields with serialized arrays are not considered.
I tested this other solution to do the filtering and it seems to work with serialized fields (deeper tests are needed ):
add_filter( 'posts_clauses', 'wpse143477_parse_clauses', 10, 2 );
function wpse143477_parse_clauses($clauses, $query) {
global $pagenow, $wpdb;
$get_url = isset($_GET['ADMIN_FILTER_FIELD_NAME']) && $_GET['ADMIN_FILTER_FIELD_NAME'] != '';
if ( is_admin() && $pagenow=='edit.php' && $get_url )
{
$keyword = $_GET['ADMIN_FILTER_FIELD_VALUE'];
$keyword = '%' . like_escape( $keyword ) . '%';
$post_ids = $wpdb->get_col( $wpdb->prepare( "
SELECT DISTINCT post_id FROM {$wpdb->postmeta}
WHERE meta_key = '%s' AND meta_value LIKE '%s'
", $_GET['ADMIN_FILTER_FIELD_NAME'], $keyword ) );
if( !empty( $post_ids )) {
$clauses['where'] .= " AND {$wpdb->posts}.ID IN (" . implode( ', ', $post_ids ) . ')';
}
}
return $clauses;
}
PS: This type of code can be functions.php , but is more appropriate as a plugin .