Ghetto query tracing for DataMapper. Put it in an initializer.

query_trace_logger.rb

class QueryTraceLogger
  def initialize(logger)
    @logger = logger
  end

  def method_missing(method_name, *args)
    if method_name == :debug
      if args.first =~ /SQL/
        Rails.logger.debug ""
        Rails.backtrace_cleaner.clean(caller).each do |line|
          Rails.logger.debug line
        end
      end
    end
    @logger.send(method_name, *args)
  end
end
DataMapper.logger = QueryTraceLogger.new(Rails.logger)