First of all,I would say sorry for my broken English and the broken codes...(many words here come from google translation...so, I\'m afraid that I can\'t make myself clear...so,
I try to avoid complex services like:
'/parents/:parent_id/children/:id'
I separate this in two services:
/parents/:parent_id/children. For GET(list) and the POST(Id in Content)
And then I have
/children/id for the PUT,DELETE and single GET