Ruby on Rails, Using Class Methods?

You should checkout named scopes for what you want to do. Checkout the following articles on how you can use scope to do what you are thinking of doing using class methods: edgerails.info/articles/what-s-new-in-ed... zachholman.com/2010/01/simplifying-rails....

I didn't understand why we need interface for this purpose, if your are looking for a way to write a method outside the class and make use of it, you may look into modules and mixins. If I understand correctly, your requirement can be fulfilled with the use of scope, User model: scope :sixth_grade, where("grade='6'") scope :programs, select("program, count(*) as program_count"). Group("program").

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