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I recently joined a new company with a large existing codebase. Most of my experience has been in developing small-medium sized apps which I was involved with since the beginning.
Does anyone have any useful tools or advice on how to begin working on a large app?
Do I start at the models and move to controllers? Are there scripts to visually map out model relationships? Should I jump in, start working on it and learn the apps structure as I go?
Railroad should help you understand the big picture. It generates diagrams for your models and controllers.