From: Steve Klabnik <steve@...>
Date: 2011-05-08T06:07:20+09:00
Subject: Re: Run time programming

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>
> For example the dynamic finders
> i.e. find_by_#{evaluated_string} are most likely eval created.
>

Sorta, yeah: method_missing which then does a class_eval to help with
performance.

https://github.com/rails/rails/blob/master/activerecord/lib/active_record/base.rb#L1018

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