/**
* Setup cache management and invalidation.
*/
public static function init()
{
/**
* Controls the length of time in seconds for which meta value lists are
* maintained before automatically being invalidated.
*
* @var int $cache_expiry
*/
self::$cache_expiry = (int) apply_filters('tribe_events_filterbar_additional_fields_cache_expiry', self::$cache_expiry);
// We invalidate the entire cache any time an event is updated, created or deleted or when event
add_action('save_post_' . Tribe__Events__Main::POSTTYPE, array(__CLASS__, 'cache_invalidate'));
add_action('deleted_post', array(__CLASS__, 'cache_invalidate_on_event_deletion'));
add_action('added_post_meta', array(__CLASS__, 'cache_invalidate_on_meta_change'), 10, 2);
add_action('updated_post_meta', array(__CLASS__, 'cache_invalidate_on_meta_change'), 10, 2);
add_action('deleted_post_meta', array(__CLASS__, 'cache_invalidate_on_meta_change'), 10, 2);
}
/**
* Return a list of possible values for this filter. This should be an array of arrays,
* with each inner array structured as follows:
*
* [ 'name' => 'some_name'
* 'value' => 'actual_value' ]
*
* @return array
*/
protected function get_values()
{
$values = Tribe__Events__Filterbar__Additional_Fields__Values::fetch($this->meta_key);
// Filter out any empty/null values that have crept in
$values = array_filter($values);
// Convert each element into a name/value array as expected by the calling method
foreach ($values as &$single_value) {
$single_value = array('name' => $single_value, 'value' => $single_value);
}
/**
* Dictate the values returned for the current additional field filter.
*
* @var array $values
* @var string $meta_key
*/
return (array) apply_filters('tribe_events_filters_additional_field_values', $values, $this->meta_key);
}
