PrestaShopCollection component in PrestaShop

In this blog, we are going to learn how to use PrestaShopCollection component in PrestaShop while developing module.

PrestaShop have a PrestaShopCollection class which is a collection of ObjectModel objects, which implements common useful interfaces available in PHP such as Iterator, ArrayAccess and Countable.

use PrestaShopCollection;

$idLang = 1;
$productCollection = new PrestaShopCollection('Product', $idLang);

$rules = new PrestaShopCollection('SpecificPriceRule');

Some of the example uses of collection
Joining associated entities

• Join manufacturer to your Product collection
• Category joining etc

$productCollection = new PrestaShopCollection('Product'); 
$productCollection->join('manufacturer');

$productCollection = new PrestaShopCollection('Product'); 
$productCollection->join('categories', 'id_category');

$productCollection->join('categories', 'id_category', PrestaShopCollection::LEFT_JOIN); 
$productCollection->join('categories', 'id_category', PrestaShopCollection::INNER_JOIN); 
$productCollection->join('categories', 'id_category', PrestaShopCollection::LEFT_OUTER_JOIN);

$productCollection = (new PrestaShopCollection('Product')) 
            ->join('manufacturer') 
            ->where('manufacturer.name', '=', 'Manufacturer AAA');

Ordering a Collection 
Collection can be ordered in ascending or descending order, with asc or desc in the $order parameter. To order collection, use the orderBy() method as shown below

$productCollection = (new PrestaShopCollection('Product')) 
           ->orderBy('reference', 'desc');

Grouping
Collection can be grouped based on a specific field, by using groupBy() method as shown below

$productCollection = (new PrestaShopCollection('Product')) 
           ->groupBy('id_supplier');

Paginating a Collection
For retrieving a large number of items, it is necessary to use pagination techniques such as SQL’s OFFSET/LIMIT. This will help in managing collection more efficiently.

$productCollection = (new PrestaShopCollection('Product')) 
              ->setPageSize(100) // will get only 100 items 
              ->setPageNumber(2); // but from page 2

Filtering a Collection
When building the Collection, you may need to filter its content. To do so, use the where() method.

$productCollection = new PrestaShopCollection('Product');
$productCollection->where('on_sale', '=', true); 
$productCollection = new PrestaShopCollection('Product');
$productCollection->where('reference', 'LIKE', 'REF-%'); // find products with reference beginning by "REF-"

Having method
There is also having() method available, which calls where() with the parameter $method set to having.

public function having($field, $operator, $value)

You can use any PrestaShop object similarly as above example to fetch, display and manipulate.

That’s all about PrestaShopCollection component class in PrestaShop. Hope it will help you.

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