Database 使用作用域对关系进行Laravel筛选

我有以下型号：

订单和订单状态

在订单模型中，我定义了关系：

    public function fullState() : ?BelongsTo
    {
        return $this->belongsTo(OrderState::class, 'order_state_id', 'id');
    }

我要做的是获取所有具有特定OrderState的订单。我已经在Order类中创建了作用域方法

在我的OrderState类中，我有以下具有作用域的方法：

    public function scopeNotCancelled(Builder $query) : Builder
    {
        return $query->where('key', '<>', self::CANCELLED);
    }

    public function scopeNotPostponed(Builder $query) : Builder
    {
        return $query->where('key', '<>', self::POSTPONED);
    }

我做错了什么，有人看得出来吗？这就是我看到的错误

  SQLSTATE[42S22]: Column not found: 1054 Unknown column 'Order.order_state_id' in 'where clause' (SQL: select * from `Order` where exists (select * from `OrderState` where `Order`.`order_state_id` = `OrderState`.`id` and `key` <> CANCELLED) and exists (select * from `OrderState` where `Order`.`order_state_id` = `OrderState`.`id` and `key` <> POSTPONED) and `order_state_id` <> 0)

---

若遵循Laravel命名约定，则表名应为Orders而不是Order。也许这就是为什么会出现未知列错误的原因。另一个提示是，不要执行？BelongsTo，例如，关系fullState将始终返回BelongsTo，它将永远不会为null。它可以为null的是该关系的数据，因此$model->fullState可以为null，但$model->fullState永远不会为null。

$salesOrders = SalesOrder::notCancelled()
            ->notPostponed()
            ->get()

  SQLSTATE[42S22]: Column not found: 1054 Unknown column 'Order.order_state_id' in 'where clause' (SQL: select * from `Order` where exists (select * from `OrderState` where `Order`.`order_state_id` = `OrderState`.`id` and `key` <> CANCELLED) and exists (select * from `OrderState` where `Order`.`order_state_id` = `OrderState`.`id` and `key` <> POSTPONED) and `order_state_id` <> 0)