Phalcon: save reference to new record in one transaction - orm

Question

Im trying to save a reference to a new object in a single transaction as shown here in the documentation under 'implicit transactions':
I am creating two new objects of the same class, one is then referencing the other. From the documentation, the save should be performed on TreeNodeA when TreeNodeB is saved and the ID will be passed to TreeNodeB->parent_tree_node_id
This doesnt seem to be working, and it still being passed as an object as Im getting the error on the save function:
Object of class TreeNodes could not be converted to string
I've tried writing a saveTreeParentNodeId function in the model and also setting it using the alias, but neither seem to work.
$treeNode = new TreeNodes();
$treeNode->setConnectionService(Registry::setConnection(MyModel::MAIN_DB));
$parentNode = $treeNode->findFirst();
$treeNodeA = new TreeNodes();
$treeNodeA->tree_id = $parentNode->tree_id;
$treeNodeA->tree_parent_node_id = $parentNode;
$treeNodeA->tree_level_id = 2;
$treeNodeA->node_desc = "Test Node A";
$treeNodeB = new TreeNodes();
$treeNodeB->tree_id = $parentNode->tree_id;
$treeNodeB->tree_parent_node_id = $treeNodeA;
$treeNodeB->tree_level_id = 3;
$treeNodeB->tree_desc = "Test Node B";
$treeNodeB->save();
The model:
class TreeNodes extends MyModel
{
public $node_id;
public $tree_id;
public $tree_parent_node_id;
public $tree_level_id;
public $node_desc;
public function getSource()
{
return "TreeNodes";
}
public function setTreeParentNodeId(TreeNodes $parentNode){
$this->tree_parent_node_id = $parentNode->node_id;
}
public function initialize()
{
parent::initialize();
$this->belongsTo(
'tree_id',
'Organisations',
'TreeID',
array(
'alias' => 'organisation',
'reusable' => true
)
);
$this->hasOne(
'tree_id',
'TreeType',
'tree_id',
array(
'alias' => 'type',
'reusable' => true
)
);
$this->hasOne(
'tree_parent_node_id',
'TreeNodes',
'node_id',
array(
'alias' => 'parentNode'
)
);
}
}
Update
By updating the model to use belongsTo, Phalcon recognises the parentNode.
$this->belongsTo(
'tree_parent_node_id',
'TreeNodes',
'node_id',
array(
'alias' => 'parentNode'
)
);
This enables $treeNodeA to save implicitly when $treeNodeB is saved.
$treeNodeA->parentNode = $parentNode;
Unfortunately, $treeNodeB with a reference to $treeNodeA as the parentNode is NOT saved. No error message is returned either, just 'true'.

Answer 1

In the documentation example you linked, they assign the $robotPart object to $robot->robotPart. robotPart refers to the linked RobotPart object and not to the ID ( to which you are trying to assign your object )
$treeNodeB = new TreeNodes();
$treeNodeB->tree_id = $parentNode->tree_id;
// $treeNodeB->tree_parent_node_id = $treeNodeA;
$treeNodeB->parentNode = $treeNodeA;
$treeNodeB->save();
You should use parentNode here because this is the name you gave to your relationship via hasOne.
I haven't tested this myself, but by following the documentation's logic, this should push you in the right direction.
Alter you model relationships so you have both sides of the relation
// let Phalcon know that "tree_parent_node_id" is a reference to "node_id"
$this->hasOne(
'tree_parent_node_id', // your column
'TreeNodes', // referenced table
'node_id', // referenced table column
array(
'alias' => 'parentNode',
'foreignKey' => true
)
);
// let Phalcon know that "node_id" is being referenced as a FK in "TreeNodes"
$this->belongsTo(
'node_id', // PK
'TreeNodes', // referenced table
'tree_parent_node_id', // referenced table column
array('foreignKey' => ['message' => 'FK constraint error between node_id and tree_parent_node_id'])
);