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@@ -473,4 +473,15 @@ class ::Array
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 end
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+module ::Enumerable
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+  def group_by_with_metadata(&block)
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+    group_by_without_metadata(&block).each do |k,v|
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+      v.origin = origin
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+      v.origin_attribute = origin_attribute
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+      v.member_class = member_class
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+    end
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+  end
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+  alias_method_chain :group_by, :metadata
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+end
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+
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 Hobo.enable if defined?(Rails)