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Observers 🧐 Observer lives longer.It can be attached & detached at any time.It is used when method is not directly associated to life cycle of Active Record objects.If you want to create observer with command-line you need to add gem first because without observer gem you couldn’t run any observer generator command so first add … Read more Ruby on Rails : Callbacks V/S Observers
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. The :concerns option can accept one or more routing concerns.