Magento 2: Use a model with a dynamic name

Question

I have a M1 module that I'm looking at porting to M2, and part of one of helpers contains code that looks like this:

public function getModel($code)
{
     return Mage::getSingleton('vendor/package_model_' . $code);
}

Given that Magento 2 uses dependency injection, I know that I can specify that I'd like an instance of \Vendor\Package\Model\Interface, but how can I specify that I'd like a specific model?

I'd like to follow best practice, so if it's possible to avoid doing this directly through the ObjectMananger then that would be ideal, but if that's the only option then that's OK too.

Answer 1

Try to get rid of this shortcut method and use dependency injection to get the actual classes you need where you previously used this.

Answer 2

I hope the code below will help you:

public function __construct(
    \Magento\Framework\ObjectManagerInterface $objectManager
) {
    $this->objectManager = $objectManager;
}

public function getModel($code)
{
    $modelins = '\Vendor\Package\Model\\' . $code;
    return $this->objectManager->get($modelins);
}

Answer 3

Finally I got the answer for how to call class from in DI.

It can be done by using factory in DI and in reader use create() it will be something like this:

<type name="Magento\Catalog\Model\Layer\Resolver">
    <arguments>
        <argument name="layersPool" xsi:type="array">
            <item name="category" xsi:type="string">Magento\Catalog\Model\Layer\CategoryFactory</item>
            <item name="search" xsi:type="string">Magento\Catalog\Model\Layer\SearchFactory</item>
        </argument>
    </arguments>
</type>

In reader file use:

public function create($layerType)
{
    return $this->layersPool[$layerType]->create();
}

So without ObjectManager we can call dynamic class from DI.