系统学习magento二次开发，推荐小册：《Magento中文全栈二次开发 》
本小册面向Magento2以上版本，书代码及示例兼容magento2.0-2.4版本。涵盖了magento前端开发，后端开发，magento2主题,magento2重写,magento2 layout,magento2控制器,magento2 block等相关内容,带领您成为magento开发技术专家。
在Magento 2中，您可以使用范围组件来限制搜索、过滤和排序操作的范围。以下是一个基本的范围示例：
use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Framework\View\Result\PageFactory;
use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
class Scope extends Action
{
protected $resultPageFactory;
protected $collectionFactory;
public function __construct(Context $context, PageFactory $resultPageFactory, CollectionFactory $collectionFactory)
{
$this->resultPageFactory = $resultPageFactory;
$this->collectionFactory = $collectionFactory;
parent::__construct($context);
}
public function execute()
{
$resultPage = $this->resultPageFactory->create();
$resultPage->getConfig()->getTitle()->set(__('Products'));
$collection = $this->collectionFactory->create();
$collection->addAttributeToSelect('*');
$collection->addAttributeToFilter('status', \Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED);
$collection->setVisibility(\Magento\Catalog\Model\Product\Visibility::VISIBILITY_BOTH);
$categoryId = $this->getRequest()->getParam('category_id');
if ($categoryId) {
$category = $this->_objectManager->create('\Magento\Catalog\Model\Category')->load($categoryId);
$collection->addCategoryFilter($category);
$resultPage->getConfig()->getTitle()->prepend(__($category->getName()));
}
$searchQuery = $this->getRequest()->getParam('q');
if ($searchQuery) {
$collection->addAttributeToFilter('name', array('like' => '%'.$searchQuery.'%'));
$resultPage->getConfig()->getTitle()->prepend(__('Search results for: "%1"', $searchQuery));
}
$sortOrder = $this->getRequest()->getParam('order');
if ($sortOrder == 'price_asc') {
$collection->addAttributeToSort('price', 'asc');
} elseif ($sortOrder == 'price_desc') {
$collection->addAttributeToSort('price', 'desc');
} elseif ($sortOrder == 'name_asc') {
$collection->addAttributeToSort('name', 'asc');
} elseif ($sortOrder == 'name_desc') {
$collection->addAttributeToSort('name', 'desc');
}
$pageSize = $this->getRequest()->getParam('limit');
if ($pageSize) {
$collection->setPageSize($pageSize);
}
$currentPage = $this->getRequest()->getParam('page');
if ($currentPage) {
$collection->setCurPage($currentPage);
}
$resultPage->getLayout()->getBlock('product_list')->setCollection($collection);
return $resultPage;
}
}在此示例中，我们使用了CollectionFactory来创建一个Product集合，并使用addAttributeToSelect、addAttributeToFilter和setVisibility等方法来设置搜索和过滤条件。我们随后检查了请求中是否包含分类ID和搜索查询，并使用addCategoryFilter和addAttributeToFilter方法来根据需要过滤结果。我们还检查了请求中是否包含排序、分页和结果限制参数，并相应地设置了集合的排序、分页和结果限制属性。最后，我们将集合传递给结果页面，以便在布局中渲染结果。