Question

我会尝试将addExpressionAttributeToSelect添加到magento集合中。当我尝试这一行时，它完美地运作：

// lat lng of Mallorca, Balearen, Spain
$lat = 39.695263;
$lng = 3.017571;
$dst = 250;
$mile2km = 1.609344;

echo "<pre>";
$col = Mage::getModel('catalog/product')->getCollection()->$this->addExpressionAttributeToSelect('latlngdistance', "ROUND(
    DEGREES(
        ACOS(
            SIN(RADIANS( $lat )) * SIN(RADIANS( {{lat}} ))
            +  COS(RADIANS( $lat )) * COS(RADIANS( {{lat}} ))
            * COS(RADIANS( $lng - {{lng}} ))
        ) * 60 * 1.1515
    ) * $mile2km
, 1)", array('lat', 'lng'));
        $this->getSelect()->having('latlngdistance <= ?', $dst);
$col->getSelect()->limit(10);
$col->load();

但是当我在一个Block中将这些方法添加到我的集合中时，Magento完全删除了我的addExpressionAttributeToSelect

错误结果：

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'latlngdistance' in 'having clause'

（我在Block_Layer中添加了这个方法，方法：Mage_Catalog_Model_Layer :: prepareProductCollection）

编辑：你必须编辑＆＃34; getSelectCountSql＆＃34;方法

EDIT2：我在reirtirte-Collection课程中的最终解决方案（在My Modul中）因此它适用于Flat和EAV Tables。所以我得到了正确数量的物品。

/**
 * Get SQL for get record count
 *
 * @param bool $resetLeftJoins
 * @return Varien_Db_Select
 */
protected function _getSelectCountSql($select = null, $resetLeftJoins = true)
{
    $countSelect = parent::_getSelectCountSql($select, $resetLeftJoins);
    if($this->getDirectCurPage() == 1)
    {
        $mile2km = $this->mile2km;

        $lat = $this->lat;
        $lng = $this->lng;

        $_col_lat = 'e.lat';
        $_col_lng = 'e.lng';
        if(!$this->isEnabledFlat()) // if flat tables did work
        {
            $attributes = Mage::getResourceModel('eav/entity_attribute_collection')
            ->setEntityTypeFilter(Mage::getModel('catalog/product')->getResource()->getTypeId())
            ->addFieldToFilter('attribute_code', array('in', array('lat', 'lng')));

            $tables = array();
            $attribute_ids = array();
            foreach ($attributes as $attribute)
            {
                $attribute_ids[$attribute->getAttributeCode()] = $attribute->getId();
                $tables[$attribute->getAttributeCode()] = $attribute->getBackendTable();
            }
            $_col_lat = 'pd_lat.value';
            $_col_lng = 'pd_lng.value';
            $countSelect->join(array('pd_lat' => $tables['lat']),
                    "e.entity_id = pd_lat.entity_id AND pd_lat.attribute_id = {$attribute_ids['lat']}", array());
            $countSelect->join(array('pd_lng' => $tables['lng']),
                    "e.entity_id = pd_lng.entity_id AND pd_lng.attribute_id = {$attribute_ids['lng']}", array());
        }

        $countSelect->columns('COUNT(DISTINCT e.entity_id) as count');
        $countSelect->columns(array('latlngdistance' => new Zend_Db_Expr("ROUND(
            DEGREES(
                ACOS(
                    SIN(RADIANS( $lat )) * SIN(RADIANS( {$_col_lat} ))
                    +  COS(RADIANS( $lat )) * COS(RADIANS( {$_col_lat} ))
                    * COS(RADIANS( $lng - {$_col_lng} ))
                ) * 60 * 1.1515
            ) * $mile2km
        , 1)")));
        $countSelect->group('latlngdistance');
        $OldcountSelect = $countSelect;
        $countSelect = $this->getConnection()->select();
        $countSelect->from(array('a' => $OldcountSelect), array('SUM(a.count)'));
        unset($OldcountSelect);
    }
    return $countSelect;
}

addExpressionAttributeToSelect添加到Magento CatalogSearch

0 个答案: