自定义 Pivot 模型与 chaperone

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\Pivot;

class RoleUser extends Pivot
{
    protected function casts(): array
    {
        return [
            'approved' => 'boolean',
        ];
    }
}

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;

class Role extends Model
{
    public function users(): BelongsToMany
    {
        return $this->belongsToMany(User::class)
            ->using(RoleUser::class);
    }
}

return $this->belongsToMany(Role::class)
    ->using(RoleUser::class)
    ->as('membership')
    ->withTimestamps()
    ->withPivot('approved');

foreach ($user->roles as $role) {
    echo $role->membership->approved;
    echo $role->membership->created_at;
}

return $this->belongsToMany(Role::class)
    ->using(RoleUser::class)
    ->withPivot('approved')
    ->withTimestamps();

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\Pivot;

class RoleUser extends Pivot
{
    public function role(): BelongsTo
    {
        return $this->belongsTo(Role::class);
    }

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }
}

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;

class Role extends Model
{
    public function users(): BelongsToMany
    {
        return $this->belongsToMany(User::class)
            ->using(RoleUser::class)
            ->chaperone();
    }
}

$role = Role::with('users')->first();

foreach ($role->users as $user) {
    // 无需额外查询，即可通过 pivot 访问父模型
    echo $user->pivot->role->name;
}

return $this->belongsToMany(User::class)
    ->using(RoleUser::class)
    ->chaperone(declaring: 'role', related: 'user');