php - Laravel 获取相关模型的相关模型

Question

我有一个与车辆关联的 RepairRequest 模型。

class RepairRequest extends \Eloquent {
    public function vehicle() {
        return $this->belongsTo('Vehicle');
    }
}


class Vehicle extends \Eloquent {
    public function requests() {
        return $this->hasMany('RepairRequest');
    }
}

我想获取与给定 RepairRequest 关联的车辆的所有 RepairRequests，所以我这样做了

return RepairRequests::find($id)->vehicle->requests;

这很好用。

但是，RepairRequests 有 RepairItems:

// RepairRequest class
public function repairItems() {
    return $this->hasMany('RepairItem', 'request_id');
}

// RepairItem class
public function request() {
    return $this->belongsTo('RepairRequest', 'request_id');
}

我也想回来，所以我做了

return RepairRequests::find($id)->vehicle->requests->with('repairItems');

但我得到以下异常:

Call to undefined method Illuminate\Database\Eloquent\Collection::with()

我该如何编写才能使返回的 json 包含 RepairRequest json 中的 RepairItems？

Answer 1

在集合上使用load 方法加载相关模型:

return RepairRequests::find($id)->vehicle->requests->load('repairItems');

基本相同:

$repairRequest = RepairRequests::with('vehicle.requests.repairItems')->find($id);

return $repairRequest->vehicle->requests;