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logger_outputs_to?(logger, *sources)

Returns true if the logger destination matches one of the sources

logger = Logger.new(STDOUT)
ActiveSupport::Logger.logger_outputs_to?(logger, STDOUT)
# => true

Source: show | on GitHub 

# File activesupport/lib/active_support/logger.rb, line 16
def self.logger_outputs_to?(logger, *sources)
  loggers = if logger.is_a?(BroadcastLogger)
    logger.broadcasts
  else
    [logger]
  end

  logdevs = loggers.map { |logger| logger.instance_variable_get(:@logdev) }
  logger_sources = logdevs.filter_map { |logdev| logdev.dev if logdev.respond_to?(:dev) }

  (sources & logger_sources).any?
end

new(*args, **kwargs)

Source: show | on GitHub 

# File activesupport/lib/active_support/logger.rb, line 29
def initialize(*args, **kwargs)
  super
  @formatter ||= SimpleFormatter.new
end