ActionView::TemplateError (superclass mismatch for class Cookie)

By Robert Fischer | Published: March 22, 2008

If you happen to see this error in Rails:
ActionView::TemplateError (superclass mismatch for class Cookie)

It really means:
Don't require CGI, because I already screwed with it, and you're just going to confuse your server. Love, Rails.

That took me a not-trivial amount of time to figure out.

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  • http://headius.blogspot.com Charles Oliver Nutter

    Superclass mismatch means the same-named class was reopened with a different superclass. Can’t do that. It must mean that Rails hasn’t namespaced its Cookie class correctly, or at least has created a Cookie that doesn’t descend the same hierarchy. Bad idea. You should file it.

  • http://www.linkedin.com/in/robertfischer Robert Fischer

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