Laravel：渴望加载特定的列

问题描述

为什么

Order::with(['products'=>function($q){
    $q->select('name','price','quantity')->orderBy('name','asc');
  }])->paginate($length);

返回所有带有其各自产品数据的订单，但是

Order::with(['products'=>function($q){
    $q->select('name','asc');
  }])->select('pickup_date','pickup_time','remark')->paginate($length);

是否提供了我想要的所有订单数据，但产品数组为空？

我想从订单表中选择一些特定列，从产品表中选择一些特定列。我该怎么办？

仅供参考：订单产品与模型之间存在多对多关系：订单型号：

public function products()
{
    return $this->belongsToMany('App\Models\Product')->withTimestamps();
}

产品型号：

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

解决方法

您需要这样选择：

Order::with(['products'=>function($q){
    $q->orderBy('name','asc');
  }])->select('products.name as name','products.price as price','products.quantity as quantity','orders.pickup_date as pickup_date','orders.pickup_time as pickup_time','orders.remark as remark')->paginate($length);

或不带子查询：

Order::with('products')
   ->select('products.name as name','orders.remark as remark')
   ->orderBy('name','asc');
   ->paginate($length);

您缺少一件事，应该在外部选择中添加产品ID。

Order::with(['products'=>function($q){
    $q->select('name','price','quantity')->orderBy('name','asc');
  }])->select('product_id','pickup_date','pickup_time','remark')->paginate($length);

我希望这会有所帮助

eager-loading eloquent laravel laravel