Preventing security issues in Ruby on Rails (based on OWASP cheatsheet)

Although core team and the community behind Ruby on Rails is working very hard to ensure that this framework is providing high level of security, it is not possible that any framework will cover every possible scenario and there is always an application on top which is usually a source of the vulnerabilities.Ruby on Rails provides security guidelines worth reading. You can find it here http://guides.rubyonrails.org/security.html.