[Rails] Contribute to open source

Hi,I learned ROR about 3 months period, i get to know some of the features on rails. I'm interested on this web programming technology, and i would like to spent some of my time to contribute a little to open source. Can anyone here give me some correct approach that I can start with small project? or any examples? Is tht neccessay that i have to expert in Ruby in contributing to open source ? like those framework such as ,devise, paperclip, omniauth ,koala ,etc(these gems that currently i'm working on) ... Any discussion is welcome for everyone :)

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