Zend CASCADE on many-to-many relationship - many-to-many

Question

I'm using the default Zend_Db_Table_Abstract to set the relationships. These are my models:
Model_Table_Project:
protected $_name = 'projects';
protected $_dependentTables = array('Model_Table_ProjectStage');
protected $_referenceMap = array(
'User' => array(
'columns' => 'userId',
'refTableClass' => 'Model_Table_User',
'refColumns' => 'id'
)
);
public function deleteProject($id)
{
$row = $this->find($id)->current();
if ($row)
{
$row->delete();
}
else
{
throw new Zend_Exception('Cannot delete project.');
}
}
Model_Table_Stage:
protected $_name = 'stages';
protected $_dependentTables = array('Model_Table_ProjectStage');
Model_Table_ProjectStage:
protected $_name = 'projectstage';
protected $_referenceMap = array(
'Project' => array(
'columns' => 'projectId',
'refTableClass' => 'Model_Table_Project',
'refColumns' => 'id',
'onDelete' => self::CASCADE,
),
'Stage' => array(
'columns' => 'stageId',
'refTableClass' => 'Model_Table_Stage',
'refColumns' => 'id',
'onDelete' => self::CASCADE,
)
);
Now when I want to delete a project, using the deleteProject() method in Model_Table_Project, it deletes the entry in the Project table and the entries in the ProjectStage table, but it doesn't delete the entries in the Stage table.
What am I doing wrong?

Answer 1

I've found the solution. It was a thinking error of myself. The solution I now use is:
In the Table model I call $row->delete() and in the Row model I declared a delete method:
public function delete()
{
$stages = $this->getStages();
foreach ($stages as $stage)
{
$stage->delete();
}
return parent::delete();
}
This way it first delete all relating stages and then it deletes itself.