Top 3 book for Rails/Ruby Development
1. The Ruby Programming Language by David Flanagan & Yukihiro Matsumoto
or
1. Programming Ruby 1.9 (3rd edition): The Pragmatic Programmers' Guide
by by Dave Thomas, with Chad Fowler and Andy Hunt
2. The Rails Way by Obie Fernandez
3. Beginning Ruby: From Novice to Professional by Peter Cooper
Also check codeschool.com they have a free ruby and free rails course,
railscasts.com has many free higher level rails screencast &
guides.rubyonrails.org has several rails guides
If you are new to programming in general then try searching for
information regarding
Object-oriented programming
if I understand you correctly just create a size variable for the
product model or (this is where oop comes in) create a tshirt class
which would inherit from the product class and give the tshirt class a
size variable to be customized in the view.
Hope this all helps
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