PROFILE table
- id
- user_id REFERENCES User.id
- profile_info
~~~
**KEY POINT**: A `BELONGS_TO` relation says that a field in **this** model points to the primary key in **another** model; in this case, _the current model owns the linking field_. **KEY POINT**: A `HAS_ONE` relation says that some **other** model has a linking field pointing to **this** model's primary key; in this case, _the related model owns the linking field_.

Let's put these in context (numbered for reference)

```php
// Post model relations