如何在laravel中使用外鍵在視圖中使用其他表的字段

Question

我有兩個表“團隊”和“用戶”。 在用戶中，我在“團隊”表中的“ID”字段中有一個外鍵（“current_team_ID）。現在我想在我們的視圖中查看用戶團隊的名稱。

這是我的控制器代碼：

public function index() {
    $user = User::orderby('id', 'desc')->paginate(20);
    $current_team_id = Teams::pluck('title', 'id');
    
    return view('admin.users.index')->with(compact('user', 'current_team_id'));
}

和索引代碼：

@foreach ($user as $item )
    <tr class="tableRows">
        <td>{{ $item->id }}</td>
        <td>{{ $item->name }}</td>
        <td>{{ $item->email }}</td>
        <td>{{ $item->stateID }}</td>
        <td>{{ $item->current_team_id }}</td>
    </tr>    
@endforeach

它只顯示團隊的“ID”，但我想顯示它的標題。 我應該怎么辦？ 謝謝

用戶模型

<?php
namespace App\Models;

use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
use Laravel\Fortify\TwoFactorAuthenticatable;
use Laravel\Jetstream\HasProfilePhoto;
use Laravel\Sanctum\HasApiTokens;

class User extends Authenticatable {
    use HasApiTokens;
    use HasFactory;
    use HasProfilePhoto;
    use Notifiable;
    use TwoFactorAuthenticatable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name',
        'username',
        'mobile',
        'personalCode' ,
        'email',
        'password',
        'stateID',
        'lastLoginDateTime',
        'token'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password',
        'remember_token',
        'two_factor_recovery_codes',
        'two_factor_secret',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];

    /**
     * The accessors to append to the model's array form.
     *
     * @var array
     */
    protected $appends = [
        'profile_photo_url',
    ];
}

團隊模型

<?php
namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Teams extends Model {
    use HasFactory;
    protected $table = 'teams';
    public $primaryKey = 'id';
    public $timestamps = false ;
}

Answer 1

如果用戶團隊定義了關系，您可以在用戶模型中執行此操作

public function team()
{
   return $this->belongsTo(Team::class);
}

public function get_team_name()
{
  if($this->team()->exists()) {    // check if the user have a related team
    return $this->team->title;
  }
}

然后在刀片循環中你可以

<td>{{ $item->get_team_name() }}</td>

Answer 2

首先讓我們創建關系

將此添加到User類

public function team(){
 return $this->belongsTo(Team::class);
}

將此添加到 Teams 類

 public function users(){
     return $this->hasMany(User::class);
    }

如果你想訪問一個用戶

  $users =  Teams::find(1)->with('users')->get();
  return view('admin.users.index')->with(compact('users');

如果你想展示一個有用戶的團隊

 @foreach($users as $user)
            <td>$user->team->title </td>
 @endforeach

Answer 3

=>add on your users table.

$table->foreign('current_team_id')->references('id')->on('teams')->onDelete('cascade');

=>add relationship on Users Model

    public function team()
        {
            return $this->hasOne(Teams::class, 'id', 'current_team_id');
        }

=>you can access directly use team relationship in the user index file.
 <td>{{$item->team->title}}</td>