Rails - Jul 2006 - ActionView::Base.field_error_proc where to put it?

I found out that ActionView::Base.field_error_proc can be modified to 
output whatever error format I want for webform elements. At the moment 
I have it sitting in application_helper.rb and it works just fine. 
However, I feel that it isn''t the proper place for it. Where do you 
normally store modified classes?

Thanks.

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