Google数据存储区无效密钥错误

Question

I'm trying to put an item to the Google Datastore using golang.

I'm always running into a datastore: invalid key error though and can't figure out what's wrong here. I'm using the "cloud.google.com/go/datastore" package.

First I try to get the key for the parent node (not sure this is the right way to do it, but I do end up getting a datastore.Key as parentKey).

When now creating a new key using the parentKey as parent and then trying to put the item with this newKey I get the invalid key error message.

q := datastore.NewQuery("Supplier")
              .Namespace("inventory")
              .Filter("Name =", "supplier-01")
              .Limit(1)
var s []supplier
parentKey, err := client.GetAll(ctx, q, &s)
if err != nil || len(parentKey) < 1 {
    fmt.Printf("could not find parent key: %v
", err)
    return
}
newKey := datastore.IncompleteKey("InventoryItem", parentKey[0])
//newKey := datastore.NameKey("InventoryItem", item.Name, parentKey[0])
if _, err := client.Put(ctx, newKey, &item); err != nil {
    fmt.Printf("could not save item: %v
", err)
    return
}

I tried it both with the NameKey and IncompleteKey but no luck with either.

I'm obviously missing something here but can't figure out what it is and how to write my item to the datastore as the child of the other node.

Answer 1

Tommy, you nailed it in your comment. You need to set the namespace on your new key. I don't see a way in the Cloud Datastore Go documentation to do this implicitly, so you'll have to do newKey.namespace = parentKey.namespace before calling Put().