Get a single item from the query Firestore-CodePudding

I'm trying to get a single document from the Firestore Firebase using Golang. I know that it is easy if you have an id, you can write something like this:

database.Collection("profiles").Doc(userId).Get(ctx)

In my case I need to find a specific document using a Where condition, and this is where I get stuck. So far I was able to come up only with the following:

database.Collection("users").Where("name", "==", "Mark").Limit(1).Documents(ctx).GetAll()

And it is obviously not the best solution since I am looking only for one (basically the first) document which follows the condition and using GetAll() seems really weird. What would be the best approach?

CodePudding user response：

The application can call Next and Stop to get a single document:

func getOne(ctx context.Context, q firestore.Query) (*firestore.DocumentSnapshot, error) {
    it := q.Limit(1).Documents(ctx)
    defer it.Stop()
    snap, err := it.Next()
    if err == iterator.Done {
        err = fmt.Errorf("no matching documents")
    }
    return snap, err
}