Getting lastInsertId from model extended by Zend_Db_Table_Abstract

Tried to get it that way inside extended model:

$th开发者_运维问答is->lastInsertId();

and getting this error:

Fatal error: Call to undefined method InsertAd::lastInsertId()

Data is added successfully to the database, but i can't get auto_incremented key.

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lastInsertId is a method of the adapter.

$id = $this->getAdapter()->lastInsertId($stuff);