long_transaction_logger.rb

module LongTransactionLogger
  def transaction(options = {}, &block)
    start_time = Time.now.to_f
    rv = super(options, &block)
    ::LongTransactionLogger.log(Time.now.to_f - start_time, self.name, caller(1))
    rv
  end

  def self.log(duration, model_name, stacktrace)
    RAILS_DEFAULT_LOGGER.error "LongTransactionLogger (#{model_name}.transaction [#{duration}s]):\n#{stacktrace.join("\n")}" if duration > 5
  end

  def self.hook!
    ::ActiveRecord::Base.extend(self)
  end
end