Render the field.
$values: The values retrieved from the database.
Overrides File::render
function render($values) {
$data = $values->{$this->field_alias};
if (!empty($this->options['file_download_path']) && $data !== NULL && $data !== '') {
$data = file_create_url($data);
}
return $this
->render_link($data, $values);
}