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doctrine2/manual/codes/Hierarchical data - Introduction - Setting up.php

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<?php
class Menu extends Doctrine_Record {
public function setTableDefinition() {
$this->setTableName('menu');
// add this your table definition to set the table as NestedSet tree implementation
// $implName is 'NestedSet' or 'AdjacencyList' or 'MaterializedPath'
// $options is an assoc array of options, see implementation docs for options
$this->actsAsTree($implName, $options);
// you do not need to add any columns specific to the nested set implementation, these are added for you
$this->hasColumn("name","string",30);
}
// this __toString() function is used to get the name for the path, see node::getPath()
public function __toString() {
return $this->get('name');
}
}
?>