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collection_group_query.go
53 lines (45 loc) · 1.37 KB
/
collection_group_query.go
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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
// [START fs_collection_group_query]
import (
"context"
"fmt"
"io"
"cloud.google.com/go/firestore"
"google.golang.org/api/iterator"
)
// collectionGroupQuery runs a collection group query over the data created by
// collectionGroupSetup.
func collectionGroupQuery(w io.Writer, projectID string) error {
ctx := context.Background()
client, err := firestore.NewClient(ctx, projectID)
if err != nil {
return fmt.Errorf("firestore.NewClient: %v", err)
}
defer client.Close()
it := client.CollectionGroup("landmarks").Where("type", "==", "museum").Documents(ctx)
for {
doc, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return err
}
fmt.Fprintf(w, "%s: %s", doc.Ref.ID, doc.Data()["name"])
}
return nil
}
// [END fs_collection_group_query]