Traits/Document/Attributable.php
public function getAttribute($key)
    {
        if (isset($this->attributes[$key])) {
            return $this->attributes[$key];
        }

        return null;
    }
public function getAttribute($key)
    {
        if (isset($this->attributes[$key])) {
            return $this->attributes[$key];
        }

        return null;
    }
Get attribute by key

@param string $group

@return array