Second level of nested relationship not available in response

[DMehaffy]

@Eturcim

Is that by design (if so, I think it worth mentioning it in the doc at some point)?

Yes by default we only populate one level deep

@Eturcim

Should I perform an extra query to fetch the missing nesting level of relationship?

You can customize the service to increase the level of population, see this answer: Simple nested array issue - #4 by DMehaffy