问题

有没有一种方法可以通过提供实体的根父级而不是完整路径来执行datastore.Get操作？

例如，假设有一个SubFolder实体，在一个Folder实体下，而该Folder实体本身又在一个User实体下。下面的代码是无效的：

subFolderKey := datastore.NewKey(c, "SubFolder", "mySubfolder", 0, userKey)
datastore.Get(c, subFolderKey, subFolder)

即使mySubfolder是userKey的孙子。

有没有一种方法可以在不指定完整父路径的情况下实现这一点？

英文:

Is there some way to perform a datastore.Get by providing not the full path of the key, but, say, the root parent of an entity?

For instance, say there's a SubFolder entity, under a Folder entity which itself is under a User entity. This doesn't work:

subFolderKey := datastore.NewKey(c, &quot;SubFolder&quot;, &quot;mySubfolder&quot;, 0, userKey)
datastore.Get(c, subFolderKey, subFolder)

even though mySubfolder is a grandchild of userKey.

Is there some way to do this without specifying full parent path?

答案1

得分: 1

不，这是不可能的。祖先路径是实体的完整键，如果你遗漏了某些内容，那么你将得到一个不完整的键。

英文:

No, that is not possible. The ancestor path is the full key of your entity so if you leave something out, you will have an incomplete key.