--- a/config/application.rb	Tue May 07 23:56:27 2013 +0900
+++ b/config/application.rb	Tue May 07 23:59:17 2013 +0900
@@ -28,10 +28,6 @@
     # Custom directories with classes and modules you want to be autoloadable.
     # config.autoload_paths += %W(#{config.root}/extras)
 
-    # Enable threaded mode except for rake tasks as it doesn't work quite well
-    # Reference: http://groups.google.com/group/rubyonrails-core/browse_thread/thread/b13dbe0b8f12b7dc
-    config.threadsafe! unless $rails_rake_task
-
     # Only load the plugins named here, in the order given (default is alphabetical).
     # :all can be used as a placeholder for all plugins not explicitly named.
     # config.plugins = [ :exception_notification, :ssl_requirement, :all ]

--- a/config/environments/development.rb	Tue May 07 23:56:27 2013 +0900
+++ b/config/environments/development.rb	Tue May 07 23:59:17 2013 +0900
@@ -6,9 +6,6 @@
   # since you don't have to restart the web server when you make code changes.
   config.cache_classes = false
 
-  # Log error messages when you accidentally call methods on nil.
-  config.whiny_nils = true
-
   # Show full error reports and disable caching
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false
@@ -25,10 +22,6 @@
   # Raise exception on mass assignment protection for Active Record models
   config.active_record.mass_assignment_sanitizer = :strict
 
-  # Log the query plan for queries taking more than this (works
-  # with SQLite, MySQL, and PostgreSQL)
-  config.active_record.auto_explain_threshold_in_seconds = 0.5 unless RUBY_PLATFORM == 'java'
-
   # Do not compress assets
   config.assets.compress = false
 

--- a/config/environments/production.rb	Tue May 07 23:56:27 2013 +0900
+++ b/config/environments/production.rb	Tue May 07 23:59:17 2013 +0900
@@ -60,8 +60,4 @@
 
   # Send deprecation notices to registered listeners
   config.active_support.deprecation = :notify
-
-  # Log the query plan for queries taking more than this (works
-  # with SQLite, MySQL, and PostgreSQL)
-  # config.active_record.auto_explain_threshold_in_seconds = 0.5
 end

--- a/config/environments/test.rb	Tue May 07 23:56:27 2013 +0900
+++ b/config/environments/test.rb	Tue May 07 23:59:17 2013 +0900
@@ -11,9 +11,6 @@
   config.serve_static_assets = true
   config.static_cache_control = "public, max-age=3600"
 
-  # Log error messages when you accidentally call methods on nil
-  config.whiny_nils = true
-
   # Show full error reports and disable caching
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false