Doctrine_manual-1-2-en

Chapter 18: Hierarchical Data 280
// ...
$category = Doctrine_Core::getTable('Category')->findOneByName('Child
Category 1');
$category->getNode()->delete();
The above code calls $category->delete() internally. It's important to delete on the
node and not on the record. Otherwise you may corrupt the tree.
Deleting a node will also delete all descendants of that node. So make sure you move them
elsewhere before you delete the node if you don't want to delete them.
Moving a Node
Moving a node is simple. Doctrine offers several methods for moving nodes around between
trees:
Listing
18-10
// test.php
// ...
$category = new Category();
$category->name = 'Root Category 2';
$category->save();
$categoryTable = Doctrine_Core::getTable('Category');
$treeObject = $categoryTable->getTree();
$treeObject->createRoot($category);
$childCategory = $categoryTable->findOneByName('Child Category 1');
$childCategory->getNode()->moveAsLastChildOf($category);
...
Below is a list of the methods available for moving nodes around:
• moveAsLastChildOf($other)
• moveAsFirstChildOf($other)
• moveAsPrevSiblingOf($other)
• moveAsNextSiblingOf($other).
The method names should be self-explanatory to you.
Examining a Node
You can examine the nodes and what type of node they are by using some of the following
functions:
Listing
18-11
// test.php
// ...
$isLeaf = $category->getNode()->isLeaf();
$isRoot = $category->getNode()->isRoot();
The above used functions return true/false depending on whether or not they are a leaf or
root node.
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