Custom log formatter which supprots severity and progname. This works well with Heroku's rails_12factor.gem

custom_log_formatter.rb

# Custom log formatter module for rails_12factor
#
module CustomLogFormatter
  # Custom formatter for development environment.
  #
  # Examples
  #
  #   # in controller
  #   logger.error(self.class) { 'This is a error message' }
  #   logger.info { 'This is a info message' }
  #
  # Output:
  #
  #   2015/08/10 20:12:05 [ERROR] HomeController -- This is a error message
  #   2015/08/10 20:12:05 [INFO ] This is a info message
  #
  class DevelopmentFormatter < ::Logger::Formatter
    include ActiveSupport::TaggedLogging::Formatter

    def call(severity, timestamp, progname, msg)
      format("%s [%-5s] %s%s\n",
             timestamp.strftime('%Y/%m/%d %H:%M:%S'),
             severity,
             progname ? "#{progname} -- " : nil,
             msg)
    end
  end

  # Custom formatter for production environment.
  #
  # Examples
  #
  #   # in controller
  #   logger.error(self.class) { 'This is a error message' }
  #   logger.info { 'This is a info message' }
  #
  # Output:
  #
  #   [ERROR] HomeController -- This is a error message
  #   [INFO ] This is a info message
  #
  class ProductionFormatter < ::Logger::Formatter
    include ActiveSupport::TaggedLogging::Formatter

    def call(severity, _, progname, msg)
      format("[%-5s] %s%s\n",
             severity,
             progname ? "#{progname} -- " : nil,
             msg)
    end
  end

  class Railtie < ::Rails::Railtie
    config.after_initialize do
      if Rails.env.production?
        config.logger.formatter = ProductionFormatter.new
      elsif Rails.env.development?
        config.logger.formatter = DevelopmentFormatter.new
      end
    end
  end
end

Using this same implementation on Rails 4.2.5, I'm getting 'method_missing': undefined method 'logger' for #<Rails::Railtie::Configuration:0x007fbfea686558> (NoMethodError) even after asserting that the before_initialize block from rails_stdout_logging (v0.0.5) runs as expected. Have you ever seen that as well? Thanks in advance.