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
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rails console production --sandbox
you will get following information
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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.