I'm working on a project where we are creating some REST APIsMy question is when we are creating an API to update an entity that contains a children reference, i.e.{    name: '...',    email: '...',    country: {        id: xxx,        name: 'xxx'    }}Does the update api accept a country object or just a country id. The country object will not be updated, only the reference to the country gets updated?My preference is country id since we are not updating the country object, but my college think otherwise. 
REST API update child reference
rest;api design