Entity/Dynamic.php
public function getField($key)
    {
        if (property_exists($this, $key)) {
            if (in_array($key, self::$ARRAY_TYPES)) {
                if (!is_string($this->$key)) {
                    return;
                }

                return json_decode($this->$key, true);
            }

            return $this->$key;
        }

        $array = $this->getData();

        if (isset($array[$key])) {
            return $array[$key];
        }
    }
public function getField($key)
    {
        if (property_exists($this, $key)) {
            if (in_array($key, self::$ARRAY_TYPES)) {
                if (!is_string($this->$key)) {
                    return;
                }

                return json_decode($this->$key, true);
            }

            return $this->$key;
        }

        $array = $this->getData();

        if (isset($array[$key])) {
            return $array[$key];
        }
    }
Get field.

@param string $key

@return string|array