- One of the fundamental principles Rails developers follow is Don’t Repeat Yourself (DRY).🔁
- We can use concerns, to avoid repeating the same routes defined.
- To eliminate code duplication rails introduced the routing method :concern.
concern :commentable do resources :comments end concern :imageable do resources :images end resources :users, concerns: :imageable resources :posts, concerns: %i[commentable imageable]
The :concerns option can accept one or more routing concerns.