By applying the principle of Convention Over Configuration, Ruby on Rails applications are designed based on the idea that you should avoid writing the same program code more than once within a web application.

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Convention Over Configuration in Ruby on Rails means that the framework makes assumptions about what you want to do and how you're going to do it, rather than requiring you to specify every little detail through configuration files. It's about reducing the number of decisions developers need to make, not specifically about avoiding writing the same code more than once, which is more directly addressed by the DRY (Don't Repeat Yourself) principle.

By Applying the Principle of Convention Over Configuration, Ruby on Rails