Question

我开始从事一个小项目，我有两个模型Building＆Apartment，每个Building可以有很多公寓。

所以我已经在模型之间创建了关系，但是当我尝试访问父（建筑物）

时出现错误

这是我的模特：

// Building.php

<?php
namespace App;

use Illuminate\Database\Eloquent\Model;
use App\Apartment;

class Building extends Model
{
    protected $guarded = [];

    public function apartment(){
        return $this->hasMany(Apartment::class);
    }
}

// Apartment.php

<?php
namespace App;

use Illuminate\Database\Eloquent\Model;
use App\Building;

class Apartment extends Model
{
    protected $guarded = [];
    
    public function building(){
        return $this->belongsTo(Building::class);
    }
}

我的控制器：

namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Apartment;
use App\Building; 

public function index()
{
    $apartment = Apartment::with('building')->get();
    return $apartment->building;
}

错误消息：Property [building] does not exist on this collection instance.

我想得到这样的结果：

Building 1
   Apartment A
   Apartment b

Building 2
   Apartment A

b公寓

Answer 1

问题在于，get方法获取公寓集合只能获取一个公寓，然后从中获取建筑物。

public function index()
{
    $apartment = Apartment::with('building')->first();
    return $apartment->building;
}

get方法返回包含结果的Illuminate\Support\Collection，其中每个结果都是PHP stdClass对象的实例。您可以通过将该列作为对象的属性进行访问来访问各列的值：

$apartaments = Apartment::with('building')->get();

foreach ($apartments as $apartament) {
    echo $apartament->building;
}

Laravel获取父级属性

1 个答案: