• active_support
• active_support/rails
• active_model
• arel
• yaml
• active_record/version
• active_record/deprecator
• active_model/attribute_set
• active_record/errors

• 模块 ActiveRecord
• 模块 ActiveRecord::AttributeMethods
• 模块 ActiveRecord::Coders
• 模块 ActiveRecord::Locking
• 模块 ActiveRecord::Middleware
• 模块 ActiveRecord::Scoping
• 模块 ActiveRecord::Tasks
• 模块 Arel