Magento model ends up with Invalid method xxx::beginTransaction(Array()

Question

I am trying to write data to a table in the database. I finally set up my model but I can not write data to it. I keep getting this error: ``` Invalid method Turnkeye_Adminform_Model_Mysql4_Iaso::beginTransaction(Array ( ) ) Trace: #0 E:\projects\magento\app\code\core\Mage\Core\Model\Abstract.php(313): Varien_Object->__call('beginTransactio...', Array) #1 E:\projects\magento\app\code\core\Mage\Core\Model\Abstract.php(313): Turnkeye_Adminform_Model_Mysql4_Iaso->beginTransaction() #2 E:\projects\magento\app\code\community\Turnkeye\Adminform\controllers\Adminhtml\AdminformController.php(47): Mage_Core_Model_Abstract->save() #3 E:\projects\magento\app\code\core\Mage\Core\Controller\Varien\Action.php(420): Turnkeye_Adminform_Adminhtml_AdminformController->saveAction() #4 E:\projects\magento\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('save') #5 E:\projects\magento\app\code\core\Mage\Core\Controller\Varien\Front.php(176):…

Accepted Answer

This does not work because your code defines

```
Turnkeye_Adminform_Model_Mysql4_Iaso extends Mage_Core_Model_Abstract
```

which is wrong.

You need to extend from a resource model, that is from a class, which is extending the abstract class `Mage_Core_Model_Resource_Abstract`. That's where `beginTransaction()` is defined.

Usually this is done by extending from `Mage_Core_Model_Mysql4_Abstract`, because there are some more methods standard mySQL resources use in Magento and these are defined thru:

```
Mage_Core_Model_Mysql4_Abstract extends
   Mage_Core_Model_Resource_Db_Abstract extends
       Mage_Core_Model_Resource_Abstract
```

So changing your definition to

```
Turnkeye_Adminform_Model_Mysql4_Iaso extends Mage_Core_Model_Mysql4_Abstract
```

should bring you back on the right track.

Magento model ends up with Invalid method xxx::beginTransaction(Array()

Solution

Problem