Can I override getLoadedProductCollection() before it’s being loaded?
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16-10-2019 - |
Question
I'm trying to override the products collection that's coming from $this->getLoadedProductCollection() so I tried to override the method
class **_**_Model_Rewrite_Layer extends Mage_Catalog_Model_Layer {
public function prepareProductCollection($collection) {
...
$collection->addAttributeToFilter('my_attribute', array('in' => array(67)));
...
}
but that doesn't seem to work. When I add
echo ( $collection->getSelect() );
the query doesn't even include the layered navigation filters so I can't overwrite their logic.
What I'm trying to do is to change how one layered navigation filter works.
Am I on the right track to override prepareProductCollection() or should I go overriding a method that's called later in the process?
Any help would be appreciated.
Solution 2
Okay, thanks to Tobias Zander I managed to solve my problem. Dunno if this is the way to go, but it's doing what it should for me, so here's my solution on this:
1. In your existing module config.xml file add the following to the <global>
scope:
<models>
<catalog_resource>
<rewrite>
<layer_filter_attribute>YourCompany_YourModule_Catalog_Model_Resource_Layer_Filter_Attribute</layer_filter_attribute>
</rewrite>
</catalog_resource>
</models>
2. Create a file in /app/code/local/YourCompany/YourModule/Catalog/Model/Resource/Layer/Filter/Attribute.php
3. Add the following to the newly created Attribute.php
file:
<?php
class YourCompany_YourModule_Catalog_Model_Resource_Layer_Filter_Attribute extends Mage_Catalog_Model_Resource_Layer_Filter_Attribute {
public function applyFilterToCollection($filter, $value) {
$collection = $filter->getLayer()->getProductCollection();
$attribute = $filter->getAttributeModel();
$connection = $this->_getReadAdapter();
$tableAlias = $attribute->getAttributeCode() . '_idx';
$conditions = array(
"{$tableAlias}.entity_id = e.entity_id",
$connection->quoteInto("{$tableAlias}.attribute_id = ?", $attribute->getAttributeId()),
$connection->quoteInto("{$tableAlias}.store_id = ?", $collection->getStoreId()),
$connection->quoteInto("{$tableAlias}.value = ?", $value)
);
if( $attribute->getAttributeCode() == 'my_attribute' ) { // Use another logic for your attribute only
$value = 'x,y,z'; // Your logic goes here to add multiple values for the SQL IN() statement below
$conditions[3] = $connection->quoteInto("{$tableAlias}.value IN($value)", $value);
}
$collection->getSelect()->join(
array($tableAlias => $this->getMainTable()),
implode(' AND ', $conditions),
array()
);
return $this;
}
}
?>
The only difference in my case is to use
$connection->quoteInto("{$tableAlias}.value IN($value)", $value)
instead of
$connection->quoteInto("{$tableAlias}.value = ?", $value)
OTHER TIPS
I've solved that by rewriting the apply() method of the Mage_Catalog_Model_Layer_Filter_Attribute class.
At that place the attribute filter is added to the collection, bevore it is executed and you can do whatever you want. I.e. for filtering <= use:
$oAttributeModel = $this->getAttributeModel();
$this->getLayer()->getProductCollection()->addAttributeToFilter(
$oAttributeModel,
array(
'lteq' => $sFilterValue,
)
);