Question

使用laravel 5.2，我有2个模型叫做命令和工人（多对多关系）

public function workers()
{
    return $this->belongsToMany('App\Worker')->withTimestamps();
}

和..

    public function orders()
{
    return $this->belongsToMany('App\Order')->withTimestamps();
}

数据透视表cantains字段称为赋值 id | order_id | worker_id |分配

我需要sync（）重新分配赋值字段。

            $order->workers()->where('assignment','Reassigned')->sync($workers);

不起作用..

Answer 1

不知道它是否有效（暂不测试），但请尝试wherePivot method

 $order->workers()->wherePivot('assignment', 'Reassigned')->sync($workers);

Answer 2

如果您有透视变量：

如果您有透视变量的关系：

public function workers()
{
    return $this->belongsToMany('App\Worker')->withTimestamps()->withPivot('value', 'value2');
}

$ workers array：

$workers[$order_id] = [
    ... // your pivot variables
    'value'         => $value,
    'created_at'    => $created_at,
    'updated_at'    => $updated_at,
]

如果您没有透视变量发送和订单数组ID

 $order->workers()->where('assignment','Reassigned')->sync([1,2,3]);

修改

尝试使用新函数中的where clausule

public function workersReassigned() { return $this->belongsToMany('App\Worker')->where('assignment','Reassigned')->withTimestamps()->withPivot('value', 'value2'); }

之后：

$order->workersReassigned()->sync($workers);

Answer 3

在模型关系中使用withPivotValue函数喜欢

public function workersReassigned()
{
    return $this->belongsToMany('App\Worker')->withPivotValue('assignment','Reassigned');
}


public function workersAnyThingElse()
{
    return $this->belongsToMany('App\Worker')->withPivotValue('assignment','AnyThingElse');
}

然后像平常一样调用Sync函数

 $order->workersReassigned()->sync($workers);
 $order->workersAnyThingElse()->sync($workers);

Laravel有很多关系sync（）在哪里

3 个答案: