How to define multiple hasMany relationships of same(parent) type on model?

I want to define multiple hasMany relationships on Ember Data model of parent type, but I don't have a clue how to specify inverses for this:

Profile = DS.Model.extend
  # ...
  friends:      DS.hasMany 'profile', async: true
  observed:     DS.hasMany 'profile', async: true
  observers:    DS.hasMany 'profile', async: true

It would be easy for me to handle such properties in database, however Ember Data doesn't support this. Is this possible to have this 3 hasMany relationships defined without creating another models (eg. Friend, Observer).

Error I'm getting:

Error: Assertion Failed: You defined the 'friends' relationship on app@model:profile:, but multiple possible inverse relationships of type app@model:profile: were found on app@model:profile:. Look at http://emberjs.com/guides/models/defining-models/#toc_explicit-inverses for how to explicitly specify inverses