The Magento Expert

Filtering product collections by category

Mex — Fri, 26 Feb 2021 07:22:18 +0000

If you want to filter a product collection by categories as well, the following code may help. Once the category filter is applied, the collection contains only products from the specified categories, in this example category IDs 123 and 456.

$_productCollection = $block->getLoadedProductCollection();
$_productCollection->clear();
$values = "123,456"; // Your category IDs
$conditionType = "in";
$_productCollection->addCategoriesFilter([$conditionType => $values])->load();

Setting the size of a collection programmatically

Mex — Thu, 16 Mar 2017 10:27:16 +0000

Use this code to set the page size of a Magento collection programmatically:

$orders = Mage::getResourceModel('sales/order_collection')->setPageSize(100);

Loading a model without using IDs

Mex — Thu, 09 Oct 2014 08:09:29 +0000

Sometimes there is no id available for loading a model. If thats the case, the following code might help out. It loads a collection by an attribute like name or sku.

$collectionData = Mage::getModel('modelname')->getCollection()->addFieldToFilter('attribute', 'attribute value');

Afterwards, it is possible to iterate over the collection, get the id and load the model using that id.

Getting the SQL of a collection

Mex — Thu, 16 May 2013 10:12:56 +0000

Use the following code to get the underlying SQL of a Magento collection:

$sql = (string)$collection->getSelect();

Getting the SQL query of a collection

Mex — Thu, 28 Feb 2013 14:08:26 +0000

This short piece of code returns the SQL query behind a Magento collection.

$select = $collection->getSelect()->__toString();