got comments to work

These should be separated.

```ruby
validates :body, presence: true
validates :user_id, presence: true
validates :review_id, presence: true
```

> If you want to be sure that an association is present, you'll need to test whether the associated object itself is present, and not the foreign key used to map the association.

```ruby
validates :body, presence: true
validates :user, presence: true
validates :review, presence: true
```