Rails - Reduce instance variable on controller

Trong controller, chung ta k nen dung qua nhieu bien instances. Toi da chi nen dung 2 bien. Neu co nhieu hon, ta nen lam 1 thu muc app/models/supports/ trong file Support se viet cac ham de lay bien install, Trong controller chi can khai bao @support = Supports::User.new sau do dung bien @support de goi den cac ham lay bien install trong view.