Better Login Forms Without Security Risks
However, more often than not, various implementations trade-off good UX for security assumptions that are out of place.
Have a look at this hidden ActiveSupport #presence_in method that provides a convenient way to do whitelisting in just one line.
Did you ever have to write a nicely indented multiline string in Ruby? There was no out-of-the-box solution until the squiggly heredoc was introduced.
Keeping your code clean and organized while developing a large Rails application can be quite a challenge, even for an experienced developer.