对voyage admin上的字符串调用成员函数relationLoaded()

我从中成功安装了voyager admin here

http://localhost:8000/admin 然后发生了错误,如图所示。

下面是第53行的图像:

<?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;
}
}