The (non-abstract) base-class Varien_Data_Collection - although it does have the setPageSize and setCurPage methods, those are not reflected within the aggregation of the Iterator:
class Varien_Data_Collection implements IteratorAggregate, Countable
{
...
/**
* Implementation of IteratorAggregate::getIterator()
*/
public function getIterator()
{
$this->load();
return new ArrayIterator($this->_items);
}
...
It will in any case return an ArrayIteator that has all objects. The load method doesn't change a thing here btw:
...
/**
* Load data
*
* @return Varien_Data_Collection
*/
public function loadData($printQuery = false, $logQuery = false)
{
return $this;
}
...
/**
* Load data
*
* @return Varien_Data_Collection
*/
public function load($printQuery = false, $logQuery = false)
{
return $this->loadData($printQuery, $logQuery);
}
...
The (non-abstract) base-class Varien_Data_Collection - although it does have the setPageSize and setCurPage methods, those are not reflected within the aggregation of the Iterator:
class Varien_Data_Collection implements IteratorAggregate, Countable
{
...
/**
* Implementation of IteratorAggregate::getIterator()
*/
public function getIterator()
{
$this->load();
return new ArrayIterator($this->_items);
}
...
It will in any case return an ArrayIteator that has all objects. The load method doesn't change a thing here btw:
...
/**
* Load data
*
* @return Varien_Data_Collection
*/
public function loadData($printQuery = false, $logQuery = false)
{
return $this;
}
...
/**
* Load data
*
* @return Varien_Data_Collection
*/
public function load($printQuery = false, $logQuery = false)
{
return $this->loadData($printQuery, $logQuery);
}
...
I'd say this qualifies as a bug, as the public interface makes one assume that the magent collection object Varien_Data_Collection provides pagination while it does not.
I have not searched for a bug-report regarding this issue. The solution is to use another iterator for pagination, for example like outlined in an answer to How to Paginate lines in a foreach loop with PHP with PHP's LimitIterator:
/**
* Class Varien_Data_Collection_Pagination
*
* Aggregates missing Pagination on Collection on getting the Iterator
*
* @author hakre <http://hakre.wordpress.com/>
*/
class Varien_Data_Collection_Pagination implements IteratorAggregate
{
/**
* @var Varien_Data_Collection
*/
private $collection;
public function __construct(Varien_Data_Collection $collection)
{
$this->collection = $collection;
}
public function getIterator()
{
$collection = $this->collection;
if (FALSE === $size = $collection->getPageSize()) {
return $collection;
}
$page = $collection->getCurPage();
if ($page < 1) {
return $collection;
}
$offset = $size * $page - $size;
return new LimitIterator(new IteratorIterator($collection), $offset, $size);
}
}
Usage Example:
$collection = new Varien_Data_Collection();
$collectionIterator = new Varien_Data_Collection_Pagination($collection);
# [...] fill collection
# set pagination:
$collection->setPageSize(3);
$collection->setCurPage(1);
echo iterator_count($collectionIterator); # 3 (int)
Hope this will help you.
