We all know that in Magento 1 We can easily instantiate model using Mage::getModel and Mage::getSingleton methods. But instantiate a model in Magento 2 something different.
In Magento 2 we can instantiate a model using Object Manager. Yes, you heard it correctly, ObjectManager is a replacement for getModel and getSingleton Method.
There are two approaches you can invoke ObjectManager in Magento 2 to instantiate a model or to get the model collection.
Approach 1: Using ObjectManager Directly anywhere
Let’s say we want to get product collection in our Magento 2 custom module phtml file. You can get this using below code.
<?php
$objectManager = MagentoFrameworkAppObjectManager::getInstance();
$productCollection = $objectManager->create('MagentoCatalogModelResourceModelProductCollectionFactory');
$productCollection->addAttributeToSelect('*');
$productCollection->load();
foreach ($productCollection as $product) {
echo "<pre>";
print_r($product->getData());
}
Approach 2: Inject model into Constructor and instantiate
Second and recommended approach of instantiating a model in Magento 2 is using a constructor. To get product collection in your custom phtml file, You need to create a block file inject the product model into the constructor of that block file.
Step 1: Create Block.php file
For example our block file Index.php is under app/code/Codextblog/Pcollection/Block/Index
<?php
namespace CodextblogPcollectionBlockIndex;
class Index extends MagentoFrameworkViewElementTemplate {
protected $_productCollectionFactory;
public function __construct(
MagentoBackendBlockTemplateContext $context,
MagentoCatalogModelResourceModelProductCollectionFactory $productCollectionFactory,
array $data = []
)
{
$this->_productCollectionFactory = $productCollectionFactory;
parent::__construct($context, $data);
}
public function getProductCollection()
{
$collection = $this->_productCollectionFactory->create();
$collection->addAttributeToSelect('*');
return $collection;
}
}
Step 2: Call getProductCollection in your phtml file
For example our phtml file Index.phtml is under app/code/Codextblog/Pcollection/view/frontend/templates
<?php
$pCollection = $block->getProductCollection();
foreach ($pCollection as $product) {
echo "<pre>";
print_r($product->getData());
}
This is how you can get product collection in your custom phtml file.
Which Approach to use?
Well, it is a very tedious task to go with approach 2 to just get product collection. But as per Magento Official doc, you should always use constructor method to instantiate a model in Magento 2 to maintain the implementation of Dependency Injection.
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