/**
* Attach conditions filter to collection
*
* @param \Magento\Eav\Model\Entity\Collection\AbstractCollection $collection
* @param Combine $combine
*
* @return void
*/
public function attachConditionToCollection(\Magento\Eav\Model\Entity\Collection\AbstractCollection $collection, Combine $combine)
{
$this->_connection = $collection->getResource()->getReadConnection();
$this->_joinTablesToCollection($collection, $combine);
$whereExpression = (string) $this->_getMappedSqlCombination($combine);
if (!empty($whereExpression)) {
// Select ::where method adds braces even on empty expression
$collection->getSelect()->where($whereExpression);
}
}