public function setCodeActivation($codeActivation)
    {
        $codeActivation = ($codeActivation === null ? $codeActivation : (string) $codeActivation);

        if ($this->exists() && $this->codeActivation !== $codeActivation) {
            $this->updated['codeActivation'] = true;
        }

        $this->codeActivation = $codeActivation;

        return $this;
    }