This is a recreation of the demo app that DHH demonstrates on the Rails home page: https://rubyonrails.org/
Also available directly on YouTube here: https://www.youtube.com/watch?v=mpWFrUwAN88
It includes everything except the portion where he uploads the app to Heroku.
The app was created on an M1 Mac, using RubyMine, with the following:
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RVM
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Ruby version 3.0.4
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Rails version 7.0.3.1
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Sqlite3
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Run the test suite using: bin/rails test
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Start the server using: bin/rails s
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Navigate to: http://localhost:3000/posts
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Deployment: that is up to the user
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Enjoy!