ActiveSupport::Logger::SimpleFormatter Ruby on Rails 5.1.2 Class ActiveSupport::Logger::SimpleFormatter < Logger::Formatter activesupport/lib/active_support/logger.rb Simple formatter which only displays the message. Methods C call Instance Public methods call(severity, timestamp, progname, msg) Link This method is invoked when a log event occurs Source: show | on GitHub # File activesupport/lib/active_support/logger.rb, line 101 def call(severity, timestamp, progname, msg) "#{String === msg ? msg : msg.inspect}\n" end