Ruby on Rails

I found the following topic in the forum:
http://www.ruby-forum.com/topic/82137

Ian J Cottee had an easy way of adding leading zeros to a number:

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"%05d" % an_int

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I'm still new to ruby, so I wanted to know. How would I put this into a
method that I can attach to whatever string I wanted.

I have the following in the view of my Rails app:

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"#{order.id} #{order.name}"

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I want to be able to create a method that will add the leading zeros to
the order.id part. I know I'll have to do something like:

"#{order.id}".leading_zeros + "#{order.name}"

I know how to create a method. I just don't know how to put that code
("%05d" % an_int) into the leading_zeros method and be able to attach it
to things.
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