Use the cluster workload rank attribute if you want puts (to queues where no instance of the queue has an active application) to complete and messages to be queued.
如果您希望(队列实例不含活动应用程序的队列)放置完成且消息被排队，则可以使用集群工作负载等级属性。
2
Active Record associates a class with a table and dynamically adds an attribute to each class for every column in the database.
Active Record将类和表关联起来，并按照数据库中的每一列给每个类动态地添加一个属性。
3
For standard validations like checking the name, length and format of an attribute, we can make use of validations provided by Active Record.