ActionView::TemplateError (superclass mismatch for class Cookie)

By Robert Fischer | March 22nd, 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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2 Comments

  1. Charles Oliver Nutter
    Posted March 23, 2008 at 9:41 AM | Permalink

    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.

    Reply
  2. Robert Fischer
    Posted March 23, 2008 at 11:05 PM | Permalink

    http://dev.rubyonrails.org/ticket/11407

    Done. :)

    Reply

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