Ruby on Rails

All of the Rails tutorials I've looked at seem to revolve around creating a new database and then making the contents of the database accessible through the web page.  The URL http://localhost:3000/users gives you access to the user list after you enter the following commands:

rails generate scaffold User name:string email:string  rake db:create:all  rake db:migrate  

But what if you already created the user database with data in it?  What is the alternative procedure for providing access to the user database at http://localhost:3000/users ?

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