private function extractLabels($choices, array &$labels)
{
foreach ($choices as $i => $choice) {
if ((is_array($choice) || $choice instanceof \Traversable) && !$choice instanceof ItemInterface) {
$labels[$i] = array();
$this->extractLabels($choice, $labels[$i]);
} elseif ($this->labelPath) {
//$labels[$i] = $this->labelPath->getValue($choice);
if (version_compare(Kernel::VERSION, '2.1') <= 0) {
$labelValue = $this->labelPath->getValue($choice);
} else {
$propertyAccessor = PropertyAccess::getPropertyAccessor();
$labelValue = $propertyAccessor->getValue($choice, $this->labelPath);
}
$labels[$i] = str_repeat('-', $choice->getLevel()) . ' ' . $labelValue;
} elseif (method_exists($choice, '__toString')) {
$labels[$i] = (string) $choice;
} else {
throw new StringCastException('A "__toString()" method was not found on the objects of type "' . get_class($choice) . '" passed to the choice field. To read a custom getter instead, set the argument $labelPath to the desired property path.');
}
}
}