How to implement?

[vnot01]

i follow your guide. and confuse.
my user detail has white blank. and not respond. The Role Menu not Show.

this is my RolePolicy

\app\Policies\RolePolicy.php

<?php
namespace App\Policies;
use App\Models\User;
use Illuminate\Auth\Access\Response;
use Pktharindu\NovaPermissions\Role;
class RolePolicy
{
    public function viewAny(User $user): bool
    {
        return true;
    }

    public function view(User $user, Role $role): bool
    {
        if ($user->hasPermissionTo('view users')) {
            return $user->id === $role->user_id;
        }
        return $user->hasPermissionTo('view users');
    }

    public function create(User $user): bool
    {
        //
    }

    public function update(User $user, Role $role): bool
    {
        //
    }

    public function delete(User $user, Role $role): bool
    {
        //
    }

    public function restore(User $user, Role $role): bool
    {
        //
    }

    public function forceDelete(User $user, Role $role): bool
    {
        //
    }
}

this is my Nova Permission

\config\nova-permissions.php

<?php
return [
    'user_model' => 'App\Models\User',
    'user_resource' => 'App\Nova\User',
    'role_resource_group' => 'Other',
    'table_names' => [
        'roles' => 'roles',
        'role_permission' => 'role_permission',
        'role_user' => 'role_user',
        'users' => 'users',
    ],
    'permissions' => [
        'view users' => [
            'display_name' => 'View users',
            'description'  => 'Can view users',
            'group'        => 'User',
        ],

        'create users' => [
            'display_name' => 'Create users',
            'description'  => 'Can create users',
            'group'        => 'User',
        ],

        'edit users' => [
            'display_name' => 'Edit users',
            'description'  => 'Can edit users',
            'group'        => 'User',
        ],

        'delete users' => [
            'display_name' => 'Delete users',
            'description'  => 'Can delete users',
            'group'        => 'User',
        ],

        'view roles' => [
            'display_name' => 'View roles',
            'description'  => 'Can view roles',
            'group'        => 'Role',
        ],

        'create roles' => [
            'display_name' => 'Create roles',
            'description'  => 'Can create roles',
            'group'        => 'Role',
        ],

        'edit roles' => [
            'display_name' => 'Edit roles',
            'description'  => 'Can edit roles',
            'group'        => 'Role',
        ],

        'delete roles' => [
            'display_name' => 'Delete roles',
            'description'  => 'Can delete roles',
            'group'        => 'Role',
        ],
    ],
];

[pktharindu]

You might have missed a step or two from the installation guide. It's hard to say what exactly without looking into the codebase.
From what you provided, the view() method in the RolePolicy doesn't look right, as the Role model doesn't have a user_id attribute.