Magento 集合中使用group子句时网格分页不起作用

我正在处理产品网格，但其分页或产品计数不起作用（因为它显示错误的计数）。 由于我的block _preparecollection函数如下所示。我在集合中添加了类别筛选代码，所以我必须使用group子句来防止相同id的错误已经存在

 protected function _prepareCollection()
    {
        $store = $this->_getStore();
        $collection = Mage::getModel('catalog/product')->getCollection()
            ->addAttributeToSelect('sku')
            ->addAttributeToSelect('name')
            ->addAttributeToSelect('attribute_set_id')
            ->addAttributeToSelect('type_id')
            ->joinField('category_id',
                'catalog/category_product',
                'category_id',
                'product_id=entity_id',
                null,
                'left');
$collection->addAttributeToFilter('category_id', array('in' => array(4,10)))
            ->distinct(true);
            $collection->getSelect()->group('e.entity_id');


        if (Mage::helper('catalog')->isModuleEnabled('Mage_CatalogInventory')) {
            $collection->joinField('qty',
                'cataloginventory/stock_item',
                'qty',
                'product_id=entity_id',
                '{{table}}.stock_id=1',
                'left');
        }
        $collection->joinField('position',
                'catalog/category_product',
                'position',
                'product_id=entity_id',
                null,
                'left');
        $collection->joinField('websites',
            'catalog/product_website',
            'website_id',
            'product_id=entity_id',
            null,
            'left');
        if ($store->getId()) {
            //$collection->setStoreId($store->getId());
            $adminStore = Mage_Core_Model_App::ADMIN_STORE_ID;
            $collection->addStoreFilter($store);
            $collection->joinAttribute(
                'name',
                'catalog_product/name',
                'entity_id',
                null,
                'inner',
                $adminStore
            );

            $collection->joinAttribute(
                'custom_name',
                'catalog_product/name',
                'entity_id',
                null,
                'inner',
                $store->getId()
            );
            $collection->joinAttribute(
                'status',
                'catalog_product/status',
                'entity_id',
                null,
                'inner',
                $store->getId()
            );
            $collection->joinAttribute(
                'visibility',
                'catalog_product/visibility',
                'entity_id',
                null,
                'inner',
                $store->getId()
            );
            $collection->joinAttribute(
                'price',
                'catalog_product/price',
                'entity_id',
                null,
                'left',
                $store->getId()
            );
        }
        else {
            $collection->addAttributeToSelect('price');
            $collection->joinAttribute('status', 'catalog_product/status', 'entity_id', null, 'inner');
            $collection->joinAttribute('visibility', 'catalog_product/visibility', 'entity_id', null, 'inner');
        }

        $this->setCollection($collection);

        parent::_prepareCollection();
        $this->getCollection()->addWebsiteNamesToResult();
        return $this;
    }

我曾在谷歌上搜索并尝试将其添加到

lib/varian/data/collection/db.php

（没有任何运气）

---

任何帮助都将不胜感激。

从magento/lib/Varien/Data/Collection/Db.php复制Db.php文件

将其粘贴到本地目录，使生成的文件夹结构如下所示：

magento/app/code/local/Varien/Data/Collection/Db.php

现在打开此文件进行编辑，并将getSelectCountSql函数替换为下面的函数

public function getSelectCountSql()
{
    $this->_renderFilters();

    $countSelect = clone $this->getSelect();
    $countSelect->reset(Zend_Db_Select::ORDER);
    $countSelect->reset(Zend_Db_Select::LIMIT_COUNT);
    $countSelect->reset(Zend_Db_Select::LIMIT_OFFSET);
    $countSelect->reset(Zend_Db_Select::COLUMNS);

    if(count($this->getSelect()->getPart(Zend_Db_Select::GROUP)) > 0) {
        $countSelect->reset(Zend_Db_Select::GROUP);
        $countSelect->distinct(true);
        $group = $this->getSelect()->getPart(Zend_Db_Select::GROUP);
        $countSelect->columns("COUNT(DISTINCT ".implode(", ", $group).")");
    } else {
        $countSelect->columns('COUNT(*)');
    }
    return $countSelect;
}

---

我先把它改成core，所以检查它是否工作，然后我会覆盖它，但它在core bro中不工作。我还提到我使用了上面的代码，但仍然不工作。

public function getSelectCountSql()
{
    $this->_renderFilters();

    $countSelect = clone $this->getSelect();
    $countSelect->reset(Zend_Db_Select::ORDER);
    $countSelect->reset(Zend_Db_Select::LIMIT_COUNT);
    $countSelect->reset(Zend_Db_Select::LIMIT_OFFSET);
    $countSelect->reset(Zend_Db_Select::COLUMNS);

    if(count($this->getSelect()->getPart(Zend_Db_Select::GROUP)) > 0) {
        $countSelect->reset(Zend_Db_Select::GROUP);
        $countSelect->distinct(true);
        $group = $this->getSelect()->getPart(Zend_Db_Select::GROUP);
        $countSelect->columns("COUNT(DISTINCT ".implode(", ", $group).")");
    } else {
        $countSelect->columns('COUNT(*)');
    }
    return $countSelect;
}