laravel - 从多对多数据透视表上的 withPivot 获取关系数据

Question

TL/DR：withPivot我使用and 和 的两个模型之间建立了多对多的关系using。我想withPivot从外键的值中获取相关数据。

---

我正在处理一个多租户项目，该项目有一个master数据库和tenant数据库。

中的任何模型App\Tenant\当前都在使用该$connection属性。

我的模型及其关联表具有以下结构：

- App/Tenant/Match
- App/Tenant/MatchTeam
- App/Team
- App/Ground

team和之间的关系match是many-to-many

（ateam可以玩多个matches，amatch可以有很多teams）

匹配.php

namespace App\Tenant
class Match extends TenantModel

public function teams() {
    return $this->belongsToMany(Team::class, 'tenant.match_team', 'match_id', 'team_uuid')
                ->using(MatchTeam::class)            
                ->withPivot('ground_id');
}

团队.php

namespace App
class Team extends Model

protected $primaryKey = 'uuid';

public $incrementing = false;

public function grounds() {
    return $this->hasMany(Ground::class, 'team_uuid', 'uuid');
}

public function matches() {
    return $this->belongsToMany(Match::class, 'tenant.match_team', 'team_uuid', 'match_id')
                ->using(MatchTeam::class)            
                ->withPivot('ground_id')
                ;
}

MatchTeam.php

class MatchTeam extends Pivot 

protected $connection = 'tenant';
protected $table = 'match_team';

public function ground() {
    return $this->hasOne(Ground::class);
}

match_team 表：

| id |     team_uuid      | match_id | ground_id | 
|----| ------------------ | -------- | --------- |
| 1  | kajdnfgkasdnfadsgn |    1     |    NULL   |
| 2  | lsdjfgsadlkfjglsdj |    2     |     4     |
| 2  | kshdfkjdshfytufjek |    3     |     1     |

---

问题：

如何访问与数据透视表ground_id上的字段相关的地面数据？match_team

我主要追求的是类似于表match->ground->name上外键的关系match_team。

---

我尝试了以下方法：

匹配控制器.php

public function show(Match $match) {
    $match = Match::where('id', $match->id)->with('ground')->first();
}

但它给Call to undefined relationship [ground]

---

DD($match) 如下要求

Interaction {#215 ▼
#table: "matches"
#connection: "tenant"
#primaryKey: "id"
#keyType: "int"
+incrementing: true
#with: []
#withCount: []
#perPage: 15
+exists: true
+wasRecentlyCreated: false
#attributes: array:19 [▶]
#original: array:19 [▶]
#changes: []
#casts: []
#dates: []
#dateFormat: null
#appends: []
#dispatchesEvents: []
#observables: []
#relations: array:1 [▼
    "ground" => null
]
#touches: []
+timestamps: true
#hidden: []
#visible: []
#fillable: []
#guarded: array:1 [▶]
}

Answer 1

正如你的错误所说，匹配模型中没有接地关系，所以在你的匹配模型中

public function ground() {
    return $this->hasOne(Ground::class,'foreign_key', 'local_key');
}

已编辑

因为我不知道表结构

可能会对您有所帮助

方法一：

if(! is_null($match->pivot->ground))
{
  $groundName = $match->pivot->ground->name;
}else{
    $groundName = 'Ground Not Set';
}

方法二：

$groundName = $match->ground['name'] ??  'Ground Not Set';