新角色没有分配给用户（在users表中的role_id设置为null）

Question

我创建了一个新角色，并尝试分配给新用户，它工作得很好但是当我尝试使用新用户凭据登录时我登录但是我收到了错误。请查看屏幕截图：

出现错误是因为它将role_id设置为null，即使选择了创建的权限。请检查屏幕截图：

 <?php

namespace TCG\Voyager\Traits;

use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
use TCG\Voyager\Facades\Voyager;
use TCG\Voyager\Models\Role;

/**
 * @property  \Illuminate\Database\Eloquent\Collection  roles
 */
trait VoyagerUser
{
    public function role()
    {
        return $this->belongsTo(Voyager::modelClass('Role'));
    }

    /**
     * Check if User has a Role(s) associated.
     *
     * @param string|array $name The role to check.
     *
     * @return bool
     */
    public function hasRole($name)
    {
        if (!$this->relationLoaded('role')) {
            $this->load('role');
        }

        return in_array($this->role->name, (is_array($name) ? $name : [$name]));
    }

    public function setRole($name)
    {
        $role = Voyager::model('Role')->where('name', '=', $name)->first();

        if ($role) {
            $this->role()->associate($role);
            $this->save();
        }

        return $this;
    }

    public function hasPermission($name)
    {
        if (!$this->relationLoaded('role')) {
            $this->load('role');
        }

        if (!$this->role->relationLoaded('permissions')) {
            $this->role->load('permissions');
        }

        return in_array($name, $this->role->permissions->pluck('key')->toArray());
    }

    public function hasPermissionOrFail($name)
    {
        if (!$this->hasPermission($name)) {
            throw new UnauthorizedHttpException(null);
        }

        return true;
    }

    public function hasPermissionOrAbort($name, $statusCode = 403)
    {
        if (!$this->hasPermission($name)) {
            return abort($statusCode);
        }

        return true;
    }
}

有人可以帮忙吗？感谢。