Spot\Entity::initFields PHP Method

    protected function initFields()
    {
        $fields = static::fields();
        foreach ($fields as $field => $opts) {
            if (!isset($this->_data[$field])) {
                $this->_data[$field] = isset($opts['value']) ? $opts['value'] : null;
            }
        }
        $entityName = get_class($this);
        if (!isset(self::$relationFields[$entityName])) {
            self::$relationFields[$entityName] = [];
        }
    }