--- a/config/environments/production.rb	Sun Nov 28 20:01:18 2021 +0900
+++ b/config/environments/production.rb	Sat Jan 15 02:07:02 2022 +0900
@@ -22,7 +22,7 @@
 
   # Disable serving static files from the `/public` folder by default since
   # Apache or NGINX already handles this.
-  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
+  config.public_file_server.enabled = ENV["RAILS_SERVE_STATIC_FILES"].present?
 
   # Compress CSS using a preprocessor.
   # config.assets.css_compressor = :sass
@@ -31,11 +31,11 @@
   config.assets.compile = false
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
-  # config.asset_host = 'http://assets.example.com'
+  # config.asset_host = "http://assets.example.com"
 
   # Specifies the header that your server uses for sending files.
-  # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
-  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
+  # config.action_dispatch.x_sendfile_header = "X-Sendfile" # for Apache
+  # config.action_dispatch.x_sendfile_header = "X-Accel-Redirect" # for NGINX
 
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
   # config.force_ssl = true
@@ -58,23 +58,17 @@
   # the I18n.default_locale when a translation cannot be found).
   config.i18n.fallbacks = true
 
-  # Send deprecation notices to registered listeners.
-  config.active_support.deprecation = :notify
-
-  # Log disallowed deprecations.
-  config.active_support.disallowed_deprecation = :log
-
-  # Tell Active Support which deprecation messages to disallow.
-  config.active_support.disallowed_deprecation_warnings = []
+  # Don't log any deprecations.
+  config.active_support.report_deprecations = false
 
   # Use default logging formatter so that PID and timestamp are not suppressed.
   config.log_formatter = ::Logger::Formatter.new
 
   # Use a different logger for distributed setups.
   # require "syslog/logger"
-  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
+  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new "app-name")
 
-  if $cfg[:log_to_stdout]
+  if ENV["RAILS_LOG_TO_STDOUT"].present?
     logger           = ActiveSupport::Logger.new(STDOUT)
     logger.formatter = config.log_formatter
     config.logger    = ActiveSupport::TaggedLogging.new(logger)
@@ -82,25 +76,4 @@
 
   # Do not dump schema after migrations.
   config.active_record.dump_schema_after_migration = false
-
-  # Inserts middleware to perform automatic connection switching.
-  # The `database_selector` hash is used to pass options to the DatabaseSelector
-  # middleware. The `delay` is used to determine how long to wait after a write
-  # to send a subsequent read to the primary.
-  #
-  # The `database_resolver` class is used by the middleware to determine which
-  # database is appropriate to use based on the time delay.
-  #
-  # The `database_resolver_context` class is used by the middleware to set
-  # timestamps for the last write to the primary. The resolver uses the context
-  # class timestamps to determine how long to wait before reading from the
-  # replica.
-  #
-  # By default Rails will store a last write timestamp in the session. The
-  # DatabaseSelector middleware is designed as such you can define your own
-  # strategy for connection switching and pass that into the middleware through
-  # these configuration options.
-  # config.active_record.database_selector = { delay: 2.seconds }
-  # config.active_record.database_resolver = ActiveRecord::Middleware::DatabaseSelector::Resolver
-  # config.active_record.database_resolver_context = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session
 end