[Rails] install rails 3 fedora 13 issues

i am in trouble i am new on fedora want to install rails 3 only how
can i please help me
if any one did that then please send me the tutorial link
issue i am facing is ruby version 1.8.6 is installed here and on using
rvm its does not change suggest me please
rvm use 1.8.7 show using ruby 1.8.7
then ruby -v shows its 1.8.6
please help

Thanks in advance

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