What's the use of has_one :through here (example from Rails guide)

Posted by piemesons on Stack Overflow See other posts from Stack Overflow or by piemesons
Published on 2010-05-26T10:25:18Z Indexed on 2010/05/26 10:41 UTC
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ruby-on-rails

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associations

Example screenshot

Why they are using has_one:through here. We can do the same with has_one only. What's the need of making a new class. Can you give me any good example?

Here is the link for the original example from Rails guide

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