Laravel eloquent model relationship

My app builds on

Laravel: 5.6.35
PHP 7.2.4
Entrust: 1.9

My Role model

class Role extends EntrustRole
{
    public function permissions()
    {
        return $this->belongsToMany(Permission::class);
    }

    public function users()
    {
        return $this->hasMany(User::class);
    }
}

And my User model is

class User extends Authenticatable
{
    public function role()
    {
        return $this->belongsTo(Role::class);
    } 
}

And now you can notice in Tinker

D:\work\www\myapp>php artisan tinker
Psy Shell v0.9.7 (PHP 7.2.4 — cli) by Justin Hileman
>>> App\models\Role::find(1)->users()->get()
Illuminate/Database/QueryException with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'users.role_id' in 'where clause' (SQL: select * from `users` where `users`.`role_id` = 1 and `users`.`role_id` is not null)'
>>> App\User::find(1)->role()->get();
=> Illuminate\Database\Eloquent\Collection {#2937
     all: [],
   }
>>> App\User::find(1)->roles()->get();
=> Illuminate\Database\Eloquent\Collection {#2941
     all: [
       App\models\Role {#2930
         id: 1,
         name: "super-admin",
         display_name: "Super Admin",
         description: "This will be one permission, that can not be assigned or modified.",
         created_at: "2018-09-07 12:11:35",
         updated_at: "2018-09-07 12:11:35",
         pivot: Illuminate\Database\Eloquent\Relations\Pivot {#2927
           user_id: 1,
           role_id: 1,
         },
       },
     ],
   }

I am getting result for App\User::find(1)->roles(), but my User model has function role(), and empty collection for App\User::find(1)->role() and error for App\models\Role::find(1)->users()

so please give some idea, how to solve this issue?