public function updateAssignments()
{
if (!$this->validate()) {
return false;
}
if (!is_array($this->items)) {
$this->items = [];
}
$assignedItems = $this->manager->getItemsByUser($this->user_id);
$assignedItemsNames = array_keys($assignedItems);
foreach (array_diff($assignedItemsNames, $this->items) as $item) {
$this->manager->revoke($assignedItems[$item], $this->user_id);
}
foreach (array_diff($this->items, $assignedItemsNames) as $item) {
$this->manager->assign($this->manager->getItem($item), $this->user_id);
}
$this->updated = true;
return true;
}