When you use validations in Rails, db column names are used as 'keys' for error messages. This is usually the preferred way to go about it because this maps nicely to the form fields. However, if you use a virtual attribute this may not be the case. For e...

On your local machine cd into the .ssh directory in your home "~/" directory. If it doesn't exist you can create it with "mkdir ~/.ssh". Next generate your public/private keys and copy the public key to the remote server. cd ~/.ssh ssh-keygen ...