Ruby On Rails console sandbox mode
If you want to perform some data migration/modification on production and you want to be sure that it will not break anything you can always perform a test run using rails console with --sandbox flag.
After entering console with
rails console production --sandbox
you will get following information
Loading production environment in sandbox (Rails X.X.X)
Any modifications you make will be rolled back on exit
You can now safely perform data migration and check if everything is OK.
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