如何使用Objectify .ids（）删除一组实体(How to delete a set of Entities using Objectify .ids())

编程入门行业动态更新时间:2024-10-28 04:27:33

我正在使用Objectify从GAE中读取一组实体：

List<CountStore> myList = ofy().load().type(CountStore.class).list();

然后我过滤，并删除myList的一些元素。我现在想要删除剩余列表中的所有ID。我认为正确的方法是使用.ids（）：

ofy().delete().type(CountStore.class).ids(myList);

但这不起作用 - 它崩溃（见下文），因为它期望myList是Long或String。任何人都可以建议删除一组实体的最佳方法吗？

谢谢！

java.lang.IllegalArgumentException: id 'com.xyz.abc.CountStore@53d71fff' must be String or Long at com.googlecode.objectify.util.DatastoreUtils.createKey(DatastoreUtils.java:66) at com.googlecode.objectify.util.DatastoreUtils.createKeys(DatastoreUtils.java:112) at com.googlecode.objectify.impl.DeleteTypeImpl.ids(DeleteTypeImpl.java:91) at com.xyz.abc.CounterServlet.doGet(CountrServlet.java:45)

...

I'm reading a set of Entities from GAE using Objectify:

List<CountStore> myList = ofy().load().type(CountStore.class).list();

I then filter, and remove some of the elements of myList. I now want to delete all the ids in the remaining list. I think the right approach is to use .ids():

ofy().delete().type(CountStore.class).ids(myList);

But this doesn't work - it crashes (see below), as it is expecting myList to be a Long or a String. Can anyone advise the best way to delete a set of Entities?

Thanks!

...

最满意答案

感谢您指出只需要一系列长ID。答案真的很简单，就是创建一个ID的ArrayList，因为我过滤了我要删除的实体：

ArrayList<Long> idList = new ArrayList<Long>(); //Do the Filtering and add IDs to the idList array the delete them all ofy().delete().type(CountStore.class).ids(idList).now();

Thanks for pointing out that an array of Long IDs is all that is needed. The answer really was quite simply to create an ArrayList of IDs as I filtered the ones Entities I want to delete:

ArrayList<Long> idList = new ArrayList<Long>(); //Do the Filtering and add IDs to the idList array the delete them all ofy().delete().type(CountStore.class).ids(idList).now();

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