What is a ruby singleton method ?
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How are observers and callbacks different from each other?
What are the different filters used in ruby on rails?
What are the differences betweeen Rails 2.x and Rails 3
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What is the difference between false and nil in ruby?
What role do sub-directory app/helpers and app/controllers play?
let me know what is ruby software and where and when it is usefull. Is it usefull to data base developer, if yes...where? thank you
what is Polymorphic Association in Ruby on Rails?
what is the difference between destroy and delete?
What is the naming convention for variables?
Explain me what is the role of rails controller?
Do you know what is rake in rails?
When are self.up and self.down methods used?