如何从 Magento 2 中的类别中获取可过滤属性

Question

我在 Magento 2 中创建了类别“包”。具有过滤器属性：

1. 颜色
2. 尺寸

我正在尝试从“包”类别中获取可过滤属性。

我已经在 Magento 1.9 中做到了：

Mage::app()->setCurrentStore($store);
$layer = Mage::getModel("catalog/layer");
$category = Mage::getModel("catalog/category")->load($categoryid);  
$layer->setCurrentCategory($category);
$attributes = $layer->getFilterableAttributes();

但它似乎不适用于 2.x

Answer 1

我最近遇到了同样的问题。

我记录了我的调查here。

我无法找到框架 api 来为特定类别提供可过滤的属性，但我将分享解决方法。

基本上 Magento 2 中的所有可过滤属性都可以从 FilterableAttributeList 中检索：

$filterableAttributes = ObjectManager::getInstance()->get(\Magento\Catalog\Model\Layer\Category\FilterableAttributeList::class);
$attributes = $filterableAttributes->getList();

请使用 DI 而不是 ObjectManager::getInstance()。我用它只是为了有更紧凑的例子:)

检索分层导航中涉及的过滤器有点棘手。

$filterableAttributes = ObjectManager::getInstance()->get(\Magento\Catalog\Model\Layer\Category\FilterableAttributeList::class);

$appState = ObjectManager::getInstance()->get(\Magento\Framework\App\State::class);
$layerResolver = ObjectManager::getInstance()->get(\Magento\Catalog\Model\Layer\Resolver::class);
$filterList = ObjectManager::getInstance()->create(
\Magento\Catalog\Model\Layer\FilterList::class,
    [
        'filterableAttributes' => $filterableAttributes
    ]
);

$category = 1234;

$appState->setAreaCode('frontend');
$layer = $layerResolver->get();
$layer->setCurrentCategory($category);
$filters = $filterList->getFilters($layer);

但是，这不是最终结果。为了确保过滤器是真实的，需要检查每个过滤器的项目数。 （该检查实际上是在核心分层导航期间执行的rendering）

$finalFilters = [];
foreach ($filters as $filter) {
    if ($filter->getItemsCount()) {
        $finalFilters[] = $filter;
    }
}

然后您可以获取过滤器名称和值。即：

$name = $filter->getName();
foreach ($filter->getItems() as $item) {
    $value = $item->getValue();
}

最后，我想添加替代解决方案，这有点残酷，我想:)

$categoryId = 1234;

$resource = ObjectManager::getInstance()->get(\Magento\Framework\App\ResourceConnection::class);
$connection = $resource->getConnection();

$select = $connection->select()->from(['ea' => $connection->getTableName('eav_attribute')], 'ea.attribute_id')
->join(['eea' => $connection->getTableName('eav_entity_attribute')], 'ea.attribute_id = eea.attribute_id')
->join(['cea' => $connection->getTableName('catalog_eav_attribute')], 'ea.attribute_id = cea.attribute_id')
->join(['cpe' => $connection->getTableName('catalog_product_entity')], 'eea.attribute_set_id = cpe.attribute_set_id')
->join(['ccp' => $connection->getTableName('catalog_category_product')], 'cpe.entity_id = ccp.product_id')
->where('cea.is_filterable = ?', 1)
->where('ccp.category_id = ?', $categoryId)
->group('ea.attribute_id');

$attributeIds = $connection->fetchCol($select);

那么就可以使用属性id来加载collection了。

 /** @var $collection \Magento\Catalog\Model\ResourceModel\Product\Attribute\Collection */
$collection = $this->collectionFactory->create();
$collection->setItemObjectClass('Magento\Catalog\Model\ResourceModel\Eav\Attribute')
        ->addStoreLabel($this->storeManager->getStore()->getId());
$collection->addFieldToFilter('attribute_id', ['in' => $attributeIds]);

Answer 2

如果您知道如何构建模块，那么您可以从“module-catalog-graph-ql\Model\Resolver\Layer”中的“FiltersProvider.php”获取帮助。

use Magento\Catalog\Model\Layer\Category\FilterableAttributeList as CategoryFilterableAttributeList;
use Magento\Catalog\Model\Layer\FilterListFactory;
use Magento\Catalog\Model\Layer\Resolver;
use Magento\Framework\UrlInterface;

public function __construct(
    Resolver $layerResolver,
    FilterListFactory $filterListFactory,
    CategoryFilterableAttributeList $categoryFilterableAttributeList,
    UrlInterface $urlBuilder
) {
    $this->_navigation = $navigation;
    $this->layerResolver = $layerResolver;
    $this->filterListFactory = $filterListFactory;
    $this->urlBuilder = $urlBuilder;
    $this->_categoryFilterableAttributeList = $categoryFilterableAttributeList;
}
public function getCatMenu($catid)
{
    $fill_arr = [];

    $filterList = $this->filterListFactory->create(['filterableAttributes' => $this->_categoryFilterableAttributeList]);

    $layer = clone $this->layerResolver->get();
    $layer->setCurrentCategory($catid);
    $filters =  $filterList->getFilters($layer);

    return $fill_arr;
}