如何在appengine实体中存储可索引列表/集合？

Question

创建实体后：

DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Entity employee = new Entity("Employee");

如何设置可索引列表属性？比如说：

employee.setProperty("tag", "manager", "corrupted", ...);
//  "tag" is the property name, 
//  "manager", "corrupted".. are the values in the list.

Answer 1

查看javadoc，您可以将Collection作为setProperty的第二个参数。

E.g

List<String> tags = new ArrayList<String>();
tags.add("manager");
tags.add("corrupted");

employee.setProperty("tag", tags);