I have stored some data on Google cloud datastore.
Querying the data is not an issue, I can use an iterator and get the properties of the data. example; https://cloud.google.com/datastore/docs/concepts/queries#projection_queries
var priorities []int
var percents []float64
it := client.Run(ctx, query)
for {
var task Task
if _, err := it.Next(&task); err == iterator.Done {
break
} else if err != nil {
log.Fatal(err)
}
priorities = append(priorities, task.Priority)
percents = append(percents, task.PercentComplete)
}
I can access the Properties of the entity with no problem but have no idea on how to read/access the keys.
How do I get the keys?
CodePudding user response:
You can see here that the iterator returns the associated key when calling Next
. In the example above it is not needed and is therefore discarded by using the blank identifier, i.e. _, err := it.Next(&task)
. If you want the key then do not discard it:
for {
var task Task
key, err := it.Next(&task)
if err != nil && err != iterator.Done {
return err
} else if err == iterator.Done {
break
}
priorities = append(priorities, task.Priority)
percents = append(percents, task.PercentComplete)
// do something with key
}