public function addProductIDs($productIDs)
    {
        $parameters = $this->request->getParameters();
        $parameters->add('id', $productIDs);
        $this->upToDate = false;
    }
public function addProductIDs($productIDs)
    {
        $parameters = $this->request->getParameters();
        $parameters->add('id', $productIDs);
        $this->upToDate = false;
    }
public function addProductIDs ( $ productIDs ) { $ parameters = $ this -> request -> getParameters ( ) ; $ parameters -> add ( 'id' , $ productIDs ) ; $ this -> upToDate = false ; }
Add one or multiple product IDs to base recommendation on, in addition to
any IDs previously set.

@param string|string[] $productIDs One or more product IDs.
Add one or multiple product IDs to base recommendation on in addition to any IDs previously set .