Edge Rider Show archive.org snapshot gives your relations a method #origin_class that returns the class the relation is based on.
This is useful e.g. to perform unscoped record look-up.

Post.recent.origin_class
# => Post

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Note that #origin_class it roughly equivalent to the blockless form of #unscoped Show archive.org snapshot from Rails 3.2+, but it works consistently across all Rails versions. #unscoped does not exist for Rails 2 and is broken in Rails 3.0.