What is the meaning of "-" in blocks of server-side code in ruby on rails?

Posted by mmacaulay on Stack Overflow See other posts from Stack Overflow or by mmacaulay
Published on 2010-04-06T00:54:12Z Indexed on 2010/04/06 1:03 UTC
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ruby-on-rails

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erb

I often see things like this in rails views:

<% form_tag some_path do -%>      
<% end -%>

Why is there a "-" at the end of each of those lines? My code works fine without it, but is it a best practice or some kind of security measure?

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