admin_nav/app/Models/Admin.php

<?php

namespace App\Models;

use Tymon\JWTAuth\Contracts\JWTSubject;
use Illuminate\Notifications\Notifiable;
use Illuminate\Database\Eloquent\SoftDeletes;
use DateTimeInterface;
use Illuminate\Foundation\Auth\User as Authenticatable;

class Admin extends Authenticatable implements JWTSubject
{
    use Notifiable;
    use SoftDeletes;

    protected $table='admins';

    protected $hidden=['password'];

    protected function serializeDate(DateTimeInterface $date)
    {
        return $date->format('Y-m-d H:i:s');
    }

    // Rest omitted for brevity

    /**
     * Get the identifier that will be stored in the subject claim of the JWT.
     *
     * @return mixed
     */
    public function getJWTIdentifier()
    {
        return $this->getKey();
    }

    /**
     * Return a key value array, containing any custom claims to be added to the JWT.
     *
     * @return array
     */
    public function getJWTCustomClaims()
    {
        return [];
    }

    public function role(){
        return $this->hasOne('App\Models\Role','id','role_id');
    }
}