[Rails] Using <a href> in a text field

If this is a really stupid noob question I apologize in advance, and
appreciate any answers I get from this.

I made a blog with rails, and just finished with the design. Upon
creating my first real post, I realized I couldn't put links in my
posts. I mean I can write links yes, but what I want to do is this:

[code]
blah blah blah <a href="http://www.site.com">site</a> blah blah blah
[/code]

So I really have no idea what to do. I googled html filters, url
filters, and url parsers for about an hour before I posted this, so any
information would be helpful. Thanks :D
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