A lot of Ruby code is "magic". We'll explain the magic and see how it works using the powerful tools Ruby gives us.
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Building a simplified version of Instagram is a great way to learn Rails.
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A class should have only a single responsibility
Learn what the Decorator design pattern does and how to implement it from scratch
Software entities should be open for extension but closed for modification
See how you can use a form object to improve the way you implement custom and complex forms in Rails
Subclasses should add to a base classes behavior, not replace it
Implement the decorator pattern with the Draper gem in your Rails application
Abstractions should not depend upon details. Details should depend upon abstractions
The Interface Segregation Principle states that no client should be forced to depend on methods it does not use
Dependency Injection is a common technique for making your code more flexible and testable by removing strict dependencies upon other classes, modules, and other types of dependencies in your code
Building a gem can be complicated. Often times you're writing abstract, meta code so it can be used flexibly in situations you'll never imagine. We'll talk about the architecture and design of the noticed gem and how it all works.
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