private function findUser()
    {
        $sql = sprintf(
            'SELECT * FROM %s WHERE %s = :identity',
            $this->getTableName(),
            $this->getIdentityColumn()
        );
        $stmt = $this->db->prepare($sql);
        $stmt->execute(array('identity' => $this->getIdentity()));

        // Explicitly setting fetch mode fixes
        // https://github.com/jeremykendall/slim-auth/issues/13
        return $stmt->fetch(PDO::FETCH_ASSOC);
    }