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retrieve.go
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retrieve.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 firestore
import (
"context"
"fmt"
"cloud.google.com/go/firestore"
"google.golang.org/api/iterator"
)
func createDocReference(client *firestore.Client) {
// [START firestore_data_reference_document]
alovelaceRef := client.Collection("users").Doc("alovelace")
// [END firestore_data_reference_document]
_ = alovelaceRef
}
func createCollectionReference(client *firestore.Client) {
// [START firestore_data_reference_collection]
usersRef := client.Collection("users")
// [END firestore_data_reference_collection]
_ = usersRef
}
func createDocReferenceFromString(client *firestore.Client) {
// [START firestore_data_reference_document_path]
// Reference to a document with id "alovelace" in the collection "users"
alovelaceRef := client.Doc("users/alovelace")
// [END firestore_data_reference_document_path]
_ = alovelaceRef
}
func createSubcollectionReference(client *firestore.Client) {
// [START firestore_data_reference_subcollection]
messageRef := client.Collection("rooms").Doc("roomA").
Collection("messages").Doc("message1")
// [END firestore_data_reference_subcollection]
_ = messageRef
}
func prepareRetrieve(ctx context.Context, client *firestore.Client) error {
// [START firestore_data_get_dataset]
cities := []struct {
id string
c City
}{
{id: "SF", c: City{Name: "San Francisco", State: "CA", Country: "USA", Capital: false, Population: 860000}},
{id: "LA", c: City{Name: "Los Angeles", State: "CA", Country: "USA", Capital: false, Population: 3900000}},
{id: "DC", c: City{Name: "Washington D.C.", Country: "USA", Capital: true, Population: 680000}},
{id: "TOK", c: City{Name: "Tokyo", Country: "Japan", Capital: true, Population: 9000000}},
{id: "BJ", c: City{Name: "Beijing", Country: "China", Capital: true, Population: 21500000}},
}
for _, c := range cities {
_, err := client.Collection("cities").Doc(c.id).Set(ctx, c.c)
if err != nil {
return err
}
}
// [END firestore_data_get_dataset]
return nil
}
func docAsMap(ctx context.Context, client *firestore.Client) (map[string]interface{}, error) {
// [START firestore_data_get_as_map]
dsnap, err := client.Collection("cities").Doc("SF").Get(ctx)
if err != nil {
return nil, err
}
m := dsnap.Data()
fmt.Printf("Document data: %#v\n", m)
// [END firestore_data_get_as_map]
return m, nil
}
func docAsEntity(ctx context.Context, client *firestore.Client) (*City, error) {
// [START firestore_data_get_as_custom_type]
dsnap, err := client.Collection("cities").Doc("BJ").Get(ctx)
if err != nil {
return nil, err
}
var c City
dsnap.DataTo(&c)
fmt.Printf("Document data: %#v\n", c)
// [END firestore_data_get_as_custom_type]
return &c, nil
}
func multipleDocs(ctx context.Context, client *firestore.Client) error {
// [START firestore_data_query]
fmt.Println("All capital cities:")
iter := client.Collection("cities").Where("capital", "==", true).Documents(ctx)
for {
doc, err := iter.Next()
if err == iterator.Done {
break
}
if err != nil {
return err
}
fmt.Println(doc.Data())
}
// [END firestore_data_query]
return nil
}
func allDocs(ctx context.Context, client *firestore.Client) error {
// [START firestore_data_get_all_documents]
fmt.Println("All cities:")
iter := client.Collection("cities").Documents(ctx)
for {
doc, err := iter.Next()
if err == iterator.Done {
break
}
if err != nil {
return err
}
fmt.Println(doc.Data())
}
// [END firestore_data_get_all_documents]
return nil
}
func getCollections(ctx context.Context, client *firestore.Client) error {
// [START firestore_data_get_sub_collections]
iter := client.Collection("cities").Doc("SF").Collections(ctx)
for {
collRef, err := iter.Next()
if err == iterator.Done {
break
}
if err != nil {
return err
}
fmt.Printf("Found collection with id: %s\n", collRef.ID)
}
// [END firestore_data_get_sub_collections]
return nil
}