如何在Laravel中实现权限的扩展和定制

public function roles()
{
    return $this->belongsToMany(Role::class, 'role_user', 'user_id', 'role_id');
}

public function permissions()
{
    return $this->belongsToMany(Permission::class, 'permission_role', 'role_id', 'permission_id');
}

public function roles()
{
    return $this->belongsToMany(Role::class, 'permission_role', 'permission_id', 'role_id');
}

public function checkPermission($permissionName)
{
    $user = Auth::user();
    if ($user->roles()->whereHas('permissions', function ($query) use ($permissionName) {
        $query->where('name', $permissionName);
    })->exists()) {
        // 用户具有该权限
        return true;
    }
    // 用户没有该权限
    abort(403, 'Unauthorized');
}

public function index()
{
    $this->checkPermission('view_users');

    // 继续处理逻辑
}

php artisan make:command CreateRole

public function handle()
{
    $roleName = $this->ask('Enter the name of the role');

    $role = new Role();
    $role->name = $roleName;
    $role->save();

    $this->info('Role created successfully');
}

php artisan make:migration create_permissions_table --create=permissions