Ember sort by attribute on relationship

In my application, a user can be related to another user, and the relationship status can be either accepted, pending, declined, and no relationship.

In my database, I have a users table, and a relationships table.

Users Table
- id

Relationships Table
- id
- from_user_id
- to_user_id
- status

In Ember, how can I get all users and sort by the relationship status?