How can I setup validation to replace before it saves?

Question

When a user inputs <h1>John to the text field and saves, I want it to be saved as >h1<John instead.

To make it possible, how can I code in my model?

It's User model's name column.

Answer 1

You just need to create a callback:

class YourModel
  before_save :sanitize_name

  private

    def sanitize_name
      self.name = CGI::escapeHTML(name)
    end
end