public function update(array $menu, $root = null)
{
// No root passed, so get the tree root node
if (is_null($root)) {
$root = $this->data;
}
// Previous menu item id
$previous = null;
// Processed menu items
// Declared static so recursion can set it's value
static $processed = array();
foreach ($menu as $item) {
// Get id from input and find the model
$id = \Arr::get($item, 'id');
$model = Model_Menu::find($id);
// If model is not found then forge it
is_null($model) and $model = Model_Menu::forge();
$properties = $this->prep_props($item);
$model->set($properties);
// If this is the first child then set it to parent
// Otherwise set it next to the previous node
if (is_null($previous)) {
$model->first_child($root)->save();
} else {
$model->next_sibling($previous)->save();
}
// Is this a new menu item? Get it's id
is_null($id) and $id = $model->id;
// Set the previous node
$previous = $model;
// This menu item is processed
$processed[] = $id;
// If there are children then call the function again
empty($item['children']) or $this->update($item['children'], $model);
}
// We are back from recusion: the current root is the tree root node
if ($root->is_root()) {
// Remove processed nodes from all nodes, so we can delete unused ones
$nodes = $root->descendants()->get();
\Arr::delete($nodes, $processed);
foreach ($nodes as $id => $model) {
$model->delete();
}
}
return true;
}
