Php 在Laravel中，使用有许多贯穿关系

如何从承包商表中获取或显示公司列以将其放入刀片中？我已经尝试使用hasManyThrough关系解决了这个问题，但它不起作用，因为我提到的所有示例都没有相同的流程

承包商表

id 
company 

id
contractor_id

id
residential_id

居民表

id 
company 

id
contractor_id

id
residential_id

买家表

id 
company 

id
contractor_id

id
residential_id

这就是模型

Contractor.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Contractor extends Model
{
    protected $table = 'contractors';
    protected $fillable = ['user_id','company','address','phone_no','email','avatar'];

    public function residential()
    {
        return $this->hasMany(Residential::class);
    }

    public function buyers()
    {
        return $this->hasManyThrough('App\Buyer', 'App\Residential');
    }

    public function buyer()
    {
        return $this->hasOneThrough('App\Buyer', 'App\Residential');
    }
}

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Buyer extends Model
{
    protected $fillable = ['buyer_id', 'name', 'address', 'phone_no', 'email', 'avatar', 'user_id', 'residential_id'];

    public function residential()
    {
        return $this->belongsTo(Residential::class);
    }
}

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Residential extends Model
{
    protected $fillable = ['name','res_code','postcode','city','state','image','contractor_id'];

    public function contractor()
    {
        return $this->belongsTo(Contractor::class);
    }

    public function buyer()
    {
        return $this->hasMany(Buyer::class);
    }
}

 public function index(Request $request)
    {
        if(Auth::user()->role == 'buyer')
            {
                $buyers = Buyer::where('user_id', '=', Auth::id())->first();
                return view('buyers.index',['buyer'=>$buyers]);
            }

<h4 class="heading"><b><center>Buyer's Details</center></b></h4>
<ul class="list-unstyled list-justify">
    <li><b>Buyer ID: </b>{{$buyer->buyer_id}}</li>
    <li><b>Name: </b>{{$buyer->name}}</li>
    <li><b>Address: </b>{{$buyer->address}}</li>
    <li><b>Residence: </b>{{$buyer->residential->name}}</li>
    <li><b>Phone Number: </b>{{$buyer->phone_no}}</li>
    <li><b>Email: </b>{{$buyer->email}}</li>
    <li><b>Contractor: </b>{{$buyer->contractor->company}}</li>
</ul>

这是我正在处理的视图，没有循环，因为这是买家登录的配置文件

index.blade.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Contractor extends Model
{
    protected $table = 'contractors';
    protected $fillable = ['user_id','company','address','phone_no','email','avatar'];

    public function residential()
    {
        return $this->hasMany(Residential::class);
    }

    public function buyers()
    {
        return $this->hasManyThrough('App\Buyer', 'App\Residential');
    }

    public function buyer()
    {
        return $this->hasOneThrough('App\Buyer', 'App\Residential');
    }
}

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Buyer extends Model
{
    protected $fillable = ['buyer_id', 'name', 'address', 'phone_no', 'email', 'avatar', 'user_id', 'residential_id'];

    public function residential()
    {
        return $this->belongsTo(Residential::class);
    }
}

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Residential extends Model
{
    protected $fillable = ['name','res_code','postcode','city','state','image','contractor_id'];

    public function contractor()
    {
        return $this->belongsTo(Contractor::class);
    }

    public function buyer()
    {
        return $this->hasMany(Buyer::class);
    }
}

 public function index(Request $request)
    {
        if(Auth::user()->role == 'buyer')
            {
                $buyers = Buyer::where('user_id', '=', Auth::id())->first();
                return view('buyers.index',['buyer'=>$buyers]);
            }

<h4 class="heading"><b><center>Buyer's Details</center></b></h4>
<ul class="list-unstyled list-justify">
    <li><b>Buyer ID: </b>{{$buyer->buyer_id}}</li>
    <li><b>Name: </b>{{$buyer->name}}</li>
    <li><b>Address: </b>{{$buyer->address}}</li>
    <li><b>Residence: </b>{{$buyer->residential->name}}</li>
    <li><b>Phone Number: </b>{{$buyer->phone_no}}</li>
    <li><b>Email: </b>{{$buyer->email}}</li>
    <li><b>Contractor: </b>{{$buyer->contractor->company}}</li>
</ul>

买方详细信息

买方ID:{{$Buyer->Buyer_ID}
名称：{{$buyer->Name}
地址：{{$buyer->Address}
住所：{{$buyer->住所->姓名}
电话号码：{{$买家->电话号码}
电子邮件：{{$buyer->Email}
承包商：{{$buyer->Contractor->company}

基于上述视图代码，我已经为住宅：建立了关系，但我无法为承包商建立关系：我希望有人能帮助我。

试试这个

那你就可以做了

$buyer->contractor->company

到

您已经在控制器中的2个型号中添加了

以下内容

$buyers = Buyer::where('user_id', '=', Auth::id())->first();
    return view('buyers.index',['buyer'=>$buyers]);

然后调用刀片文件

$buyers->residential->contractor->company

检查这里我做了这里提到的我得到了这个错误。调用模型[App\Buyer]上未定义的关系[contractor]。当前，这是在my contractor.php``public function residential（）{return$this->hasMany（residential:：class）；}``Buyer.php``public function residential（）{return$this->belongsTo（residential:：class）；}``Residential.php``public function contractor（）{return$this->belongsTo（contractor:：class）；}public function buyer（）{return$this->hasMany（buyer:：class）；}``上一个是正确的。我忘了删除控制器中的某些内容，非常抱歉。非常感谢你帮助我@IrdinaZulkeflee好的，我正在更新并标记这个答案，然后是我得到的这个错误。SQLSTATE[42S22]：未找到列：“字段列表”中的1054未知列“residentials.buyer_id”（SQL:选择
承包商
*，
住宅
作为
住宅
承包商

内部连接

住宅

上的

住宅

住宅

id

承包商住宅住宅其中

住宅

住宅

<(7))