rails--rails/activesupport/lib/active_support/logger_silence.rb

require 'active_support/concern'

module LoggerSilence
  extend ActiveSupport::Concern
  
  included do
    cattr_accessor :silencer
    self.silencer = true
  end

  # Silences the logger for the duration of the block.
  def silence(temporary_level = Logger::ERROR)
    if silencer
      begin
        old_logger_level, self.level = level, temporary_level
        yield self
      ensure
        self.level = old_logger_level
      end
    else
      yield self
    end
  end
end