如何使用laravel eloquent relationsips从相互关联的表中提取数据。

Question

我想得到那些已经申请旅行的客户的电子邮件。

我有三张桌子 trips, service_requests, users

以下是我的表格是如何关联的

在Trips模型中

 public function requests(){
        return $this->hasMany(ServiceRequest::class);
    }

在ServiceRequest模型中

public function customer()
    {
        return $this->belongsTo(User::class, "customer_id");
    }

这是我用来获取结果的代码，我得到了我想要的结果，但我只想得到客户的电子邮件地址数组。

 $trip_customers = Trip::with('requests.customer')
                ->whereHas('requests', function($query){
                    $query->where('status', 2);
                })->get()->pluck('requests');

上面的输出是

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [id] => 1
                    [user_id] => 2
                    [customer_id] => 1
                    [post_ad_id] => 
                    [trip_id] => 1
                    [pickup_date] => 2020-06-15
                    [dropoff_date] => 2020-06-18
                    [address] => Lane C 20, Gokul Enclave
                    [contact_no] => 8451515
                    [weight] => 681
                    [person] => 
                    [additional_comments] => eretrt
                    [status] => 2
                    [view_status] => 1
                    [customer] => Array
                        (
                            [id] => 1
                            [name] => Customer
                            [email] => [email protected]
                            [mobile_number] => 51551
                            [status] => 1
                        )

                )

        )

)

Answer 1

你可以尝试从Customer端进入，因为你只需要从该表获取信息。

Customer::whereHas('requests', function ($query) {
    $query->where('status', 2);
})->pluck('email');

假设Customer和ServiceRequest之间有关系.