If you are on a unix system and want to set up a crontab (cron job) and you are using RVM, you must make sure to make bash act as if it had been invoked as a login shell by using the bash -l option.
So if you were going to have a script run at midnight every 24 hours, you put something like this in your crontab. I assume the your_script.sh calls your .rb code from within it.
0 0 * * * bash -l /home/username/your_script.sh
If you wanted to call your ruby code directly from the crontab, then you would do something like this:
0 0 * * * bash -l -c /home/username/your_ruby_code.rb
Be sure your .rb file is executable and has something like the following as its first line:
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