Relationship between two table - With construction

I have three tables

course_registrations
| id | user_id | created_at|

users
| id | name | password | workplace_id |

workplaces
| id | name |

I need get all items from courseRegistration, with user, and workplace name.

I have this query, but not working correctly, workplace only show int of workplace_id

CourseRegistration::with('user')->with('workplace')->get();

My relations is:

public function user(){
    return $this->hasOne('App\User', 'id', 'user_id');
}

--

public function workplace()
{
    return $this->hasOne(Workplace::class, 'id', 'workplace_id');
}

What is bad? How to fix it?

Thanks.