use existence of 'Rails::Application' as indicator of Rails App instead of 'Rails', as many Ruby applications are using railties such as generators outside Rails

Author: sickate

lib/annotate.rb

@@ -137,7 +137,7 @@ def self.eager_load(options)
     load_requires(options)
     require 'annotate/active_record_patch'
 
-    if defined?(Rails)
+    if defined?(Rails::Application)
       if Rails.version.split('.').first.to_i < 3
         Rails.configuration.eager_load_paths.each do |load_path|
           matcher = /\A#{Regexp.escape(load_path)}(.*)\.rb\Z/