Pass vim variable to ruby function

[Akbar]

Hi,

This is my ruby script:
VIM::command("function! OpenRequire(open)
                ruby open_require(open)
              endfunction")

But open is not recognized by ruby. But I can do this:
VIM::command("function! OpenRequire(open)
                echo a:open
              endfunction")

This does not work too:
VIM::command("function! OpenRequire(open)
                ruby open_require(a:open)
              endfunction")

How do I pass vim function argument to ruby function. Thank you.