how to debug rubny on rails application on aptana 3 studio

Hi i am using rails 3.0.12 and ruby 1.9 and Aptana studio3, just i
started to learn ruby on rails , i got one sample project from open
source, i want to debug and see the flow of compiling. i am not getting
how to debug rails application line by line and how i see the values
while debugging, any one have idea please help me out.

Thanks in advance


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