Custom module collection not working

[gosogoso]

I'm trying to follow Alan Storm's tutorial here.

The code works fine when I try to insert or retrieve a single record, but it cracks when I use collections. I followed all steps he illustrated in the tutorial, which drives me crazy because only collections wouldn't work!!

public function __construct(
    \Magento\Backend\App\Action\Context $context,
    \Vendor\Mymodule\Model\ConfigurationsFactory $myClass
) {
    $this->myClass = $myClass;
    parent::__construct($context);
}

public function execute() {

     $todo = $this->myClass->create();

     $collection = $todo->getCollection();

     foreach($collection as $item)
      {
        var_dump('Item ID: ' . $item->getConfigId());
        var_dump($item->getData());
      }
    exit;

}

This gives the following error:
Vendor\Mymodule\Model\Configurations does not extend \Magento\Framework\DataObject

any help would be really appreciated.

[avstudnitz]

You already have the error message:

Vendor\Mymodule\Model\Configurations does not extend \Magento\Framework\DataObject

Only models which extend \Magento\Framework\DataObject can have collections. So, first step is to make your model extend that class (or better: extend \Magento\Framework\Model\AbstractModel which again extends the mentioned class as in Alan Storm's example). If you get more errors, you should upload the whole module.

[Shrinet]

Hello,

  I already extended my Model with \Magento\Framework\Model\AbstractModel but still I am getting same error. My model code is 

class Post extends AbstractModel implements PostInterface, IdentityInterface {

Please guide me....