I want to initialize some data on factory->create() without passing in the create(["mydata" => 1]).

What's the way to create MyFactoryClass with custom create() for MyClass in my module?

I find not dev doc for the same or any article.

1 Answer 1


Let's say that your class for which you want the factory is this Vendor\Module\Model\MyClass.
now you can create the class Vendor\Module\Model\MyClassFactory in the same folder as your initial class.

namespace Vendor\Module\Model;

class MyClassFactory implements MyInterface
     public function create() 

class MyInterfaceFactory extends MyClassFactory
    // this class is added so that there no Type Error
    // while using MyInterfaceFactory/MyClassFactory

Creating this means that Magento will not autogenerate the factory class for your class anymore. It will use your factory instead.

  • What are the benefits of factory class ? Commented Aug 31, 2020 at 12:33
  • @HamendraSunthwal. You have one single point of instantiating the same kind objects, you can mock it easily in unit tests
    – Marius
    Commented Aug 31, 2020 at 13:19
  • @Marius Thanks for the confirmation! MyClass is implemented by MyInterface so MyInterfaceFactory needs to be mapped in di.xml to my custom MyClassFactory ? Commented Aug 31, 2020 at 13:26
  • Also getting this error for no reason: Magento/Framework/Exception/RuntimeException with message 'Type Error occurred when creating object: Commented Aug 31, 2020 at 13:32
  • 1
    clear the contents of generated/code and generated/metadata
    – Marius
    Commented Aug 31, 2020 at 13:34

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