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module ThinkingSphinx
  class Search
    class << self
      alias_method :original_set_sort_options!, :set_sort_options!
      
      def set_sort_options!(client, options)
        expr = options[:sort_expr]
        if expr.nil?
          original_set_sort_options!(client, options)
        else
          client.sort_mode = :expr
          client.sort_by = expr
        end
      end
    end # class << self
  end # Search
end # ThinkingSphinx