phalcon resultset complex direct use - phalcon

Question

I have two tables and I am using phalcon's phql to join them.
In my controller i have:
$oBuilder = $this->modelsManager->createBuilder();
$oBuilder->columns(['Tabone.*', 'Tabtwo.*']);
$oBuilder->from(['Tabone']);
$oBuilder->join('Tabtwo', 'Tabone.id = Tabtwo.id');
$oBuilder->where('Tabone.id = 1');
$aRecords = $oBuilder->getQuery()->execute();
/** #var Phalcon\Mvc\Model\Resultset\Complex $aRecords */
//this doesnt work as expected
$aRecords[0]->tabone->setVal(2);
echo "2 != ".$aRecords[0]->tabone->getVal()."<br>";
echo get_class($aRecords[0]->tabone).'<br>';
//this works as expected
$aRecords->getFirst()->tabone->setVal(2);
echo "2 == ".$aRecords->getFirst()->tabone->getVal()."<br>";
So, with the Phalcon's Complex Traversable resultset I am able to set properties using :
$resultset->getFirst()->tabone->setVal(2);
echo $resultset->getFirst()->tabone->getVal();
But when i try :
echo get_class($aRecords[0]->tabone); // Says tabone
$resultset[0]->tabone->setVal(2);
echo $resultset[0]->tabone->getVal();
the value remains unchanged. even though $aRecords[0]->tabone is the class Tabone.
These are my models
class Tabone extends \Phalcon\Mvc\Model
{
public $id;
public $val;
public function columnMap() {
return array( 'id' => 'id', 'val' => 'val' );
}
public function setVal($val) { $this->val = $val; }
public function getVal() { return $this->val; }
}
class Tabtwo extends \Phalcon\Mvc\Model
{
public $id;
public function columnMap() {
return array( 'id' => 'id' );
}
}
these are the mysql tables and values
CREATE TABLE tabone (
id INT(11) NOT NULL AUTO_INCREMENT,
val INT(11) NOT NULL DEFAULT '0',
PRIMARY KEY (id)
);
CREATE TABLE tabtwo (
id INT(11) NOT NULL,
PRIMARY KEY (id)
);
INSERT INTO tabone (id, val) VALUES (1, 1);
INSERT INTO tabtwo (id) VALUES (1);
Why are the setters/getters no working when using [0] ?
Am i doing something i shouldn't ? ...

Answer 1

because it is how it works. you have methods for these things available like:
offsetGet() // Gets row in a specific position of the resultset
getFirst() // Get first row in the resultset
getLast() // Get last row in the resultset
all methods are here: http://docs.phalconphp.com/en/latest/api/Phalcon_Mvc_Model_Resultset_Complex.html
it's good practice to not use array's key, to keep it simple imagine this:
you are using setters & getters, instead simply setting var's value. But when you want to implement new validation for some input field, you have to go through all the code where you set value, not only just edit your setter. i believe it has some same logic going on here, but i am not developing core of the phalcon, i if you want to get more details you should go check their C code here: https://github.com/phalcon/cphalcon

Answer 2

With information found on:
http://forum.phalconphp.com/discussion/945/why-properties-of-models-are-lost-
(...) when a resultset is traversed, only just one record is kept in memory,
if you modify a record changes will lost, because the record is freed
once it is not used anymore. This scheme is very efficient if you are
traversing big resultsets (...)
and on
Scala: What is the difference between Traversable and Iterable traits in Scala collections?
(...) complying with the Traversable interface does not require
keeping state
So, the reason why [0] does not set properties is because traversable means just
that, it only traverses the object, any values set directly in the traversed object
will be lost, because the object state is not kept.
This makes perfect sense especially when you are talking about large result sets
as it will save tons of memory.