GraphQL: Shorthands for fetching only one field of an object

[lcdr]

Currently the API only supports syntax such as a { b { c } }. This means that to get to c, the client needs to do a bunch of null checks on the surrounding objects, and the serialization is also more complex than need be. We could add support for a shorthand a.b.c to fetch only one field of an object.

Question is how well this would work with the schema, since this would blow up the number of available fields considerably. To limit the schema to something finite we would at the least need to stop when reaching cycles.