Flarum\Core\Post::newFromBuilder PHP Method

    public function newFromBuilder($attributes = [], $connection = null)
    {
        $attributes = (array) $attributes;
        if (!empty($attributes['type']) && isset(static::$models[$attributes['type']]) && class_exists($class = static::$models[$attributes['type']])) {
            /** @var Post $instance */
            $instance = new $class();
            $instance->exists = true;
            $instance->setRawAttributes($attributes, true);
            $instance->setConnection($connection ?: $this->connection);
            return $instance;
        }
        return parent::newFromBuilder($attributes, $connection);
    }