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Injecting interfaces, singleton, factory, models in Magento 2
class SomeClass
* @var \Magento\Framework\App\Config\ScopeConfigInterface
private $configInterface;
* @var \Magento\Framework\App\Config
private $concreteConfig;
* @var \Magento\Framework\App\ConfigFactory
private $configFactory;
public function __construct(
// Preferred for singleton => Inject a singleton but let Magento chose which concrete class thanks to DI
\Magento\Framework\App\Config\ScopeConfigInterface $configInterface, // Resolves to \Magento\Framework\App\Config
// Inject a concrete singleton
\Magento\Framework\App\Config $concreteConfig,
// Inject the factory of the model for later instanciation. Magento will automatically create the class in the /generated dir when required
\Magento\Framework\App\ConfigFactory $configFactory
$this->configInterface = $configInterface;
$this->concreteConfig = $concreteConfig;
$this->configFactory = $configFactory;
public function someMethod()
// Singleton: first way
$firstSingleton = $this->configInterface->getValue('some/path');
// Singleton: second way
$secondSingleton = $this->concreteConfig->getValue('some/path');
// New instance
/** @var \Magento\Framework\App\Config $newConfig */
$newConfig = $this->configFactory->create();
$newValue = $newConfig->getValue('some/path');
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