I'm using the "cloud.google.com/go/datastore" library in my Go application (library version below), and am running into an error datastore: invalid entity type when I use the Ancestor() query.
Here's my method call:
ctx := context.Background()
client, err := datastore.NewClient(ctx, "MyProjectId", option.WithCredentialsFile(myJsonFile))
// ... err check ...
myId := 112233
myKey := datastore.IDKey("MyKind", myId, nil)
query := datastore.NewQuery("").Ancestor(myKey)
it := client.Run(*ctx, query)
c = &struct{ ... }
key, err := it.Next(&c)
// ... err check ...
However, when I check the value of err, it's non-nil and has the message: datastore: invalid entity type. When I go into the cloud console and try what I think would be the equivalent GQL (e.g. SELECT * WHERE __key__ HAS ANCESTOR KEY(MyKind, 112233)), it does indeed return results in the cloud console.
I also didn't find a convenient way to print out debugging information in the "cloud.google.com/go/datastore" library to see what it's actually sending, so any help would be much appreciated there.
Any ideas on how I might debug this, or is it an issue in the Go library? Thank you!
P.S. Here's the "cloud.google.com/go/datastore" version I'm using:
commit f0afaf5fad3c46ae392ebab6b7553d37d65d07ac (HEAD -> master, origin/master, origin/HEAD)
Author: [redacted]
Date: Thu May 31 13:15:30 2018 -0700
oslogin: generate v1 client
Change-Id: I515527be0e8acc1fe55cab969df9f76fd8d93b26
There's a bug in the code above which is passing a double reference to a struct.
c = &struct{ ... }
key, err := it.Next(&c)
Should actually be:
c = &struct{ ... }
key, err := it.Next(c)
Unfortunately the "Next" function returns a datastore: invalid entity type rather than something a little more... helpful ;)