addAttributeToFilter on magento return incorrect -

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i got problem when overriden mage_catalog_block_product_list class in magento. goal add filter @ overriden class. code

public function getloadedproductcollection() {     $collection = parent::_getproductcollection();     $collection->addattributetofilter('model',  array('eq' => 'coucu'));      var_dump($collection->count()); // return 1 (incorrect)     var_dump($collection->getdata()); // return empty (correct)     return $collection; }

i need after filter don't have product!

most of time due collection being loaded. have know magento collection load once (to save db access) because there flag _setisloaded on underlaying varien_data_collection stop reload it.

what can try 

public function getloadedproductcollection() {     $collection = parent::_getproductcollection();     var_dump($collection->isloaded());     return $collection; }

if displays true means collection loaded , addattributetofilter won't ever executed. , going case because, function not called getloadedproductcollection no reason.

there 2 ways resolve this.
best : override setcollection instead

public function setcollection($collection) {     $this->_productcollection = $collection;     $this->_productcollection->addattributetofilter('model',  array('eq' => 'coucu'));     return $this; }

the not because collection loaded twice , surcharge db :

public function getloadedproductcollection() {     $collection = parent::_getproductcollection();     $collection->clear();      // resets _isloaded flag     /** @see varien_data_collection::clear() */     $collection->addattributetofilter('model',  array('eq' => 'coucu'));     return $collection; }

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