I often open a rails console to play around with some data and make sure I
understand how some models can be instantiated while respecting their
associations. There are plenty of times where I've created some data in the
development database that doesn't need to be there. It may even be incomplete
data from a failed experiment.
This data accumlates and clutters up the database.
One way to avoid this is by running the console in a sandboxed mode. Include
the --sandbox flag when starting up a session to do this.
$ rails console --sandbox
Loading development environment in sandbox (Rails 5.2.6)
Any modifications you make will be rolled back on exit
[1] pry(main)>This wraps the session in a transaction so that any writes to the database can be rolledback afterward.