Routes, Controllers, and Views in Rails

This article is part of the Ruby for AI series, teaching you how to build web applications that can serve AI-powered features using Ruby on Rails. Understanding the Request Flow Every web request in Rails follows a predictable path. A user sends a request, Rails matches it to a route, a controller processes it, and a view renders the response. Mastering this flow is essential for building applications that can handle AI workloads, from processing form inputs to displaying model predictions. Defining Routes Routes live in config/routes.rb and map URLs to controller actions. Rails uses a DSL that reads like English. # config/routes.rb Rails . application . routes . draw do root "predictions#index" get "/predictions" , to: "predictions#index" get "/predictions/new" , to: "predictions#new" post "/predictions" , to: "predictions#create" # Resourceful routes generate all standard paths resources :sentiments , only: [ :index , :create ] end Run rails routes to see all defined paths. For AI ap