How can I get all data from my tables with relationship in Laravel?

So, I have table like:

```
*users*
id
username
password
...

*address*
id
address
user_id
...

```

If I call my eloquent model with Address::all() I get response with user\_id, and I want to make relationships for getting username.

I try to add:

```
public function users(){
  return $this->belongsTo('Users', 'user_id');
}

```

And call with `Address::with('users')->get()`, but response is empty.