My team has decided to use ROAR for your app; however, I am finding the lack of documentation quite frustrating. The current README mentions "There’s even more, nesting, collections, but more on that later!" but never follows up. There seems to be no documentation on collections, and I have been unable to decipher the source code. This lack of decent documentation makes using ROAR quite painful, to the point that I am considering finding something else that both meets our needs and is well-documented.