I found necessary to make this patch to /lib/active_scaffold/actions/
nested.rb:

    def nested_association
      if active_scaffold_constraints.keys.to_s == ""
        logger.info "It's empty string"
      end
      return active_scaffold_constraints.keys.to_s.to_sym if nested?
and active_scaffold_constraints.keys.to_s != ""
      # MY PATCH: and active_scaffold_constraints.keys.to_s != ""
      nil
    end

Without that, I get error complaining because
active_scaffold_constraints.keys.to_s is "" and cannot go to_sym.

For the moment I can live with this patch (I have rails 2.2.2 and the
commit of AS 2.2 (ex master) of 01/13/09).

I will go to rails 2.3 as soon as possible and test this bug again
later.

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