• active_support/core_ext/enumerable
• active_support/core_ext/module/delegation
• active_support/parameter_filter
• concurrent/map

• 模块 ActiveRecord
• 模块 ActiveRecord::ConnectionAdapters
• 模块 ActiveRecord::Core
• 模块 ActiveRecord::Core::ClassMethods
• 模块 ActiveSupport
• 模块 Arel
• 类 ActiveRecord::Core::InspectionMask