How to configure Ruby on Rails with no database?

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For Rails 3 and Rails 4:

Use -O(Capital ‘O’) or --skip-activerecord option to generate an application without a database.

rails new myApp -O

or

rails new myApp --skip-activerecord

This Answer is reshared from here

For Rails 5:

Use --skip-active-record option to generate an application without a database

Notice the extra hyphen ‘-‘ as opposed to previous Rails versions.

rails new myApp --skip-active-record

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