I thought so too but:
```
2.0.0-p195 :002 > User.to_a
NoMethodError: undefined method `to_a' for #<Class:0x007fe87281c0d8>
2.0.0-p195 :003 > User.all.to_a
  User Load (0.3ms)  SELECT `users`.* FROM `users`
 => [] 
```