Rails 3: How to return errors in a JSON request?

How can I return a 800, 404, etc error when a user makes a JSON/XML request to my API?

I've tried

error 404, {:error => "ERror".to_json }

with no success.

Also, I've tried to put a "respond_to" but it doesn't work as well (it duplicates the respond_to and gives error).

Thanks

json ruby-on-rails-3

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