Magento 以任意顺序获取产品集合 [英] Magento get a product collection in an arbitrary order

问题描述

我为我们的 Magento 商店开发了一个自定义搜索引擎，我正在尝试以非常特定的顺序加载产品系列(我已经根据我设计的算法对结果进行了排名).

I have developed a custom search engine for our Magento store and I am trying to load the product collection in a very specific order (I have ranked the results according to an algorithm I designed).

我可以正确加载产品集合，但它不是我想要的顺序.现在它的工作原理如下:

I can load the product collection correctly, however it is not in the order that I would like it to be in. Here is basically how it is working now:

我的数据库查询基本上返回一个包含产品 ID 的 PHP 数组.对于这个例子，假设它看起来像这样:

My database query basically comes back with a PHP array of product IDs. For this example lets say it looks like this:

$entity_ids = array(140452, 38601 );

现在我可以调换 140452 和 38601，并且产品集合每次都以相同的顺序返回.我希望产品集合与实体 ID 的 ID 顺序相同.

Now I can transpose the 140452 and the 38601 and the product collection comes back in the same order each time. I would like the product collection to be in the same order as the ID of the entity ids.

我用来创建我的收藏的代码如下:

The code I am using to create my collection is as follows:

$products = Mage::getModel('catalog/product')
    ->getCollection()
    ->addAttributeToSelect('*')
    ->addAttributeToFilter('entity_id', array('in' => $entity_ids))
    ->setPageSize($results_per_page)
    ->setCurPage($current_page)
    ->load();

有没有办法将排序顺序设置为 $entity_ids 数组的顺序?

Is there a way to set the sort order to be the order of the $entity_ids array?

推荐答案

集合继承自类

Varien_Data_Collection_Db

该类中有一个名为 addOrder 的方法.

There's a method named addOrder on that class.

public function addOrder($field, $direction = self::SORT_ORDER_DESC)
{
    return $this->_setOrder($field, $direction);
}

所以，你会认为这样的东西应该适用于基本的订购

So, you'd think something like this should work for basic ordering

Mage::getModel('catalog/product')
->getCollection()
->addAttributeToSelect('*')
->addOrder('entity_id');

然而，事实并非如此.由于 EAV 集合中涉及的复杂连接，有一种特殊的方法用于向 order 子句添加属性

However, it doesn't. Because of the complex joining involved in EAV Collections, there's a special method used to add an attribute to the order clause

Mage_Catalog_Model_Resource_Eav_Mysql4_Product_Collection::addAttributeToSort

然而，这只能用于添加简单的属性.要创建任意排序，您需要直接操作 Zend_Select 对象.我不喜欢这个，也不喜欢使用自定义的 mysql 函数来实现，但它似乎是唯一的方法

However again, this can only be used to add simple attributes. To create an arbitrary sort, you'll need to manipulate the Zend_Select object directly. I'm not a big fan of this, and I'm not a big fan of using custom mysql functions to achieve things, but it appears it's the only way to do this

我在股票安装上测试了以下代码并获得了预期的结果.您应该能够使用它来获得您想要的东西.

I tested the following code on a stock install and got the desired results. You should be able to use it to get what you want.

        $ids = array(16,18,17,19);
        $products = Mage::getModel('catalog/product')->getCollection()
        ->addAttributeToSelect('*')
        ->addAttributeToFilter('entity_id',$ids);           

                    //shakes fist at PDO's array parameter
                    $ids = array_map('intval', $ids);
        $products->getSelect()->order("find_in_set(e.entity_id,'".implode(',',$ids)."')");
        foreach($products as $product)
        {
            var_dump($product->getEntityId());
            var_dump($product->getSku());
        }

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