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4. Managing Data Flow: Controllers and Models
It’s time to meet the key player in Rails applications. Controllers are the components that determine how to respond to user requests and coordinate responses. They’re at the heart of what many people think of as “the program” in your Rails applications, though in many ways they’re more of a switchboard. They connect the different pieces that do the heavy lifting, providing a focal point for application development. The model is the foundation of your application’s data structures, which will let you get information into and out of your databases.
Warning
Controllers are important, certainly a “key player,” but don’t get too caught up in them. When coming from other development environments, it’s easy to think that controllers are the main place you should put application logic. As you get deeper into Rails, you’ll likely learn the hard way that a lot of code you thought belonged in the controller really belonged in the model, or sometimes in the view.
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