In the middle to late Rails period, there are some patterns that are implicit, for example, DCI, Presenter and Form object. In my view, Rails is not Rails anymore; it's going beyond buffet (as mention in his talk: https://www.youtube.com/watch?v=Cx6aGMC6MjU). It's like it provides LEGO building blocks and people use them with their own plasticine shapes. Data flow through in weird manner. IIRC, there is a place where Rails copies all in-controller's instance variables to in-view's instance variables, and tell people to pretend that they are the same objects.

Ruby itself is strange (in implicit way) enough on how things are defined and called. Maybe it's just me, I don't even understand its OOP although I came from C++ background.