Rails 6 Finance Tracker from the Complete Ruby on Rails Developer course by Mashrur Hossain at Udemy
It can be seen running here. It's a free Heroku instance, so it'll take up to 30 seconds to load the first time.
Lesson 246 - App complete
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I commit my files much more often than Mashrur suggests. generally at the completion of each lesson, at least.
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I have styled the app a bit differently.
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I have deployed to Heroku more often too.
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Mashrur performs three separate SQL queries for users and then deduplicates the results. It is much better to perform one query, which will return a set of results with no duplicates.