Requesting data from two related objects is usually not easy in Rest requests. Normally, you have to make separate API calls to get the exact data you want. Flow uses filter-traversable objects to make this possible in a single call.
For example, to request a list of users within a team whose name includes the word feedme, use the following request.
Object traversal uses the double underscore syntax.
Request:
https://flow.pluralsight.com/v3/customer/core/users/?team__name=feedme
Response:
Traversable objects are indicated in the object definitions with filter-traversable object.