API错误4（datastore_v3：NEED_INDEX）：找不到匹配的索引

Question

I am currently attempting to upload a Guest Book application in Go that uses datastore for GAE found here.

Running a GAE server from my computer using goapp serve, the application runs and works fine. I submitted two entries, and shut down the server. But, when uploaded immediately after using goapp deploy -application xxx app.yaml, I get API error 4 (datastore_v3: NEED_INDEX): no matching index found. on my URL. It has been about a day or so since I last served the files.

Any help is appreciated

Answer 1

You can remove '.Order("-Date")' in Line 41, and try to deploy it again.

The reason is that q.Order("key") uses the EntitiesByKind index, which is not supported, see in google-app-engine-reverse-key-order-query