Ruby on Rails as a framework follows the Model-View-Controller design pattern. Three core elements, like the number of layers in a traditional birthday cake, are enough to “cook” web applications. However, on the long haul, the Rails cake often resembles a crumble cake with the layers smeared and crumb-bugs all around the kitchen-codebase. Similarly to birthday cakes, adding new layers is easier to do and maintain as the application grows than increasing the existing layers in size. How to extract from or add new layers to a Rails application? What considerations should be taken into account? Why is rainbow cake the king of layered cakes? Join my talk to learn about the layering Rails approach to keep applications healthy and maintainable.