[fw-db] Zend DB and find (strange behaviour)

My RelationModel:

class RelationModel extends Zend_Db_Table_Abstract {
protected $_name = 'relations';
protected $_primary = array('id');

public function fetchAll($select=null) {
if(is_null($select))
$select = parent::select();

$select->setIntegrityCheck(false); => this is the problem

$select->from($this->_name)
->joinLeft('common_countries',
'common_countries.id=relations.country_id',
array('country)
)

$results = parent::fetchAll($select);
return $results;
}

My Controller:

$model = new RelationModel();
$results = $model->find(1);

it's returning : "Fatal error: Call to a member function setIntegrityCheck()
on a non-object in ..."
Why is it going in my 'RelationModel' and calls the function fetchAll?
Anyone had the same problem?

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