ธุรกรรมและการเขียนแบบกลุ่ม

Web

import { runTransaction } from "firebase/firestore";

try {
  await runTransaction(db, async (transaction) => {
    const sfDoc = await transaction.get(sfDocRef);
    if (!sfDoc.exists()) {
      throw "Document does not exist!";
    }

    const newPopulation = sfDoc.data().population + 1;
    transaction.update(sfDocRef, { population: newPopulation });
  });
  console.log("Transaction successfully committed!");
} catch (e) {
  console.log("Transaction failed: ", e);
}
transaction.js

Web

// Create a reference to the SF doc.
var sfDocRef = db.collection("cities").doc("SF");

// Uncomment to initialize the doc.
// sfDocRef.set({ population: 0 });

return db.runTransaction((transaction) => {
    // This code may get re-run multiple times if there are conflicts.
    return transaction.get(sfDocRef).then((sfDoc) => {
        if (!sfDoc.exists) {
            throw "Document does not exist!";
        }

        // Add one person to the city population.
        // Note: this could be done without a transaction
        //       by updating the population using FieldValue.increment()
        var newPopulation = sfDoc.data().population + 1;
        transaction.update(sfDocRef, { population: newPopulation });
    });
}).then(() => {
    console.log("Transaction successfully committed!");
}).catch((error) => {
    console.log("Transaction failed: ", error);
});
test.firestore.js

Swift

let sfReference = db.collection("cities").document("SF")

do {
  let _ = try await db.runTransaction({ (transaction, errorPointer) -> Any? in
    let sfDocument: DocumentSnapshot
    do {
      try sfDocument = transaction.getDocument(sfReference)
    } catch let fetchError as NSError {
      errorPointer?.pointee = fetchError
      return nil
    }

    guard let oldPopulation = sfDocument.data()?["population"] as? Int else {
      let error = NSError(
        domain: "AppErrorDomain",
        code: -1,
        userInfo: [
          NSLocalizedDescriptionKey: "Unable to retrieve population from snapshot \(sfDocument)"
        ]
      )
      errorPointer?.pointee = error
      return nil
    }

    // Note: this could be done without a transaction
    //       by updating the population using FieldValue.increment()
    transaction.updateData(["population": oldPopulation + 1], forDocument: sfReference)
    return nil
  })
  print("Transaction successfully committed!")
} catch {
  print("Transaction failed: \(error)")
}
ViewController.swift

Objective-C

FIRDocumentReference *sfReference =
    [[self.db collectionWithPath:@"cities"] documentWithPath:@"SF"];
[self.db runTransactionWithBlock:^id (FIRTransaction *transaction, NSError **errorPointer) {
  FIRDocumentSnapshot *sfDocument = [transaction getDocument:sfReference error:errorPointer];
  if (*errorPointer != nil) { return nil; }

  if (![sfDocument.data[@"population"] isKindOfClass:[NSNumber class]]) {
    *errorPointer = [NSError errorWithDomain:@"AppErrorDomain" code:-1 userInfo:@{
      NSLocalizedDescriptionKey: @"Unable to retreive population from snapshot"
    }];
    return nil;
  }
  NSInteger oldPopulation = [sfDocument.data[@"population"] integerValue];

  // Note: this could be done without a transaction
  //       by updating the population using FieldValue.increment()
  [transaction updateData:@{ @"population": @(oldPopulation + 1) } forDocument:sfReference];

  return nil;
} completion:^(id result, NSError *error) {
  if (error != nil) {
    NSLog(@"Transaction failed: %@", error);
  } else {
    NSLog(@"Transaction successfully committed!");
  }
}];
ViewController.m

Kotlin+KTX

val sfDocRef = db.collection("cities").document("SF")

db.runTransaction { transaction ->
    val snapshot = transaction.get(sfDocRef)

    // Note: this could be done without a transaction
    //       by updating the population using FieldValue.increment()
    val newPopulation = snapshot.getDouble("population")!! + 1
    transaction.update(sfDocRef, "population", newPopulation)

    // Success
    null
}.addOnSuccessListener { Log.d(TAG, "Transaction success!") }
    .addOnFailureListener { e -> Log.w(TAG, "Transaction failure.", e) }
DocSnippets.kt

Java

final DocumentReference sfDocRef = db.collection("cities").document("SF");

db.runTransaction(new Transaction.Function<Void>() {
    @Override
    public Void apply(@NonNull Transaction transaction) throws FirebaseFirestoreException {
        DocumentSnapshot snapshot = transaction.get(sfDocRef);

        // Note: this could be done without a transaction
        //       by updating the population using FieldValue.increment()
        double newPopulation = snapshot.getDouble("population") + 1;
        transaction.update(sfDocRef, "population", newPopulation);

        // Success
        return null;
    }
}).addOnSuccessListener(new OnSuccessListener<Void>() {
    @Override
    public void onSuccess(Void aVoid) {
        Log.d(TAG, "Transaction success!");
    }
})
.addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception e) {
        Log.w(TAG, "Transaction failure.", e);
    }
});
DocSnippets.java

Dart

final sfDocRef = db.collection("cities").doc("SF");
db.runTransaction((transaction) async {
  final snapshot = await transaction.get(sfDocRef);
  // Note: this could be done without a transaction
  //       by updating the population using FieldValue.increment()
  final newPopulation = snapshot.get("population") + 1;
  transaction.update(sfDocRef, {"population": newPopulation});
}).then(
  (value) => print("DocumentSnapshot successfully updated!"),
  onError: (e) => print("Error updating document $e"),
);
firestore.dart

Java

// Initialize doc
final DocumentReference docRef = db.collection("cities").document("SF");
City city = new City("SF");
city.setCountry("USA");
city.setPopulation(860000L);
docRef.set(city).get();

// run an asynchronous transaction
ApiFuture<Void> futureTransaction =
    db.runTransaction(
        transaction -> {
          // retrieve document and increment population field
          DocumentSnapshot snapshot = transaction.get(docRef).get();
          long oldPopulation = snapshot.getLong("population");
          transaction.update(docRef, "population", oldPopulation + 1);
          return null;
        });
// block on transaction operation using transaction.get()
ManageDataSnippets.java

Python

transaction = db.transaction()
city_ref = db.collection("cities").document("SF")

@firestore.transactional
def update_in_transaction(transaction, city_ref):
    snapshot = city_ref.get(transaction=transaction)
    transaction.update(city_ref, {"population": snapshot.get("population") + 1})

update_in_transaction(transaction, city_ref)
snippets.py

Python

transaction = db.transaction()
city_ref = db.collection("cities").document("SF")

@firestore.async_transactional
async def update_in_transaction(transaction, city_ref):
    snapshot = await city_ref.get(transaction=transaction)
    transaction.update(city_ref, {"population": snapshot.get("population") + 1})

await update_in_transaction(transaction, city_ref)
snippets.py

C++

DocumentReference sf_doc_ref = db->Collection("cities").Document("SF");
db->RunTransaction([sf_doc_ref](Transaction& transaction,
                                std::string& out_error_message) -> Error {
    Error error = Error::kErrorOk;

    DocumentSnapshot snapshot =
        transaction.Get(sf_doc_ref, &error, &out_error_message);

    // Note: this could be done without a transaction by updating the
    // population using FieldValue::Increment().
    std::int64_t new_population =
        snapshot.Get("population").integer_value() + 1;
    transaction.Update(
        sf_doc_ref,
        {{"population", FieldValue::Integer(new_population)}});

    return Error::kErrorOk;
  }).OnCompletion([](const Future<void>& future) {
  if (future.error() == Error::kErrorOk) {
    std::cout << "Transaction success!" << std::endl;
  } else {
    std::cout << "Transaction failure: " << future.error_message() << std::endl;
  }
});
snippets.cpp

Node.js

// Initialize document
const cityRef = db.collection('cities').doc('SF');
await cityRef.set({
  name: 'San Francisco',
  state: 'CA',
  country: 'USA',
  capital: false,
  population: 860000
});

try {
  await db.runTransaction(async (t) => {
    const doc = await t.get(cityRef);

    // Add one person to the city population.
    // Note: this could be done without a transaction
    //       by updating the population using FieldValue.increment()
    const newPopulation = doc.data().population + 1;
    t.update(cityRef, {population: newPopulation});
  });

  console.log('Transaction success!');
} catch (e) {
  console.log('Transaction failure:', e);
}
index.js

Go

import (
	"context"
	"log"

	"cloud.google.com/go/firestore"
)

func runSimpleTransaction(ctx context.Context, client *firestore.Client) error {
	// ...

	ref := client.Collection("cities").Doc("SF")
	err := client.RunTransaction(ctx, func(ctx context.Context, tx *firestore.Transaction) error {
		doc, err := tx.Get(ref) // tx.Get, NOT ref.Get!
		if err != nil {
			return err
		}
		pop, err := doc.DataAt("population")
		if err != nil {
			return err
		}
		return tx.Set(ref, map[string]interface{}{
			"population": pop.(int64) + 1,
		}, firestore.MergeAll)
	})
	if err != nil {
		// Handle any errors appropriately in this section.
		log.Printf("An error has occurred: %s", err)
	}

	return err
}
save_transaction_document_update.go

PHP

$cityRef = $db->collection('samples/php/cities')->document('SF');
$db->runTransaction(function (Transaction $transaction) use ($cityRef) {
    $snapshot = $transaction->snapshot($cityRef);
    $newPopulation = $snapshot['population'] + 1;
    $transaction->update($cityRef, [
        ['path' => 'population', 'value' => $newPopulation]
    ]);
});
transaction_document_update.php

Unity

DocumentReference cityRef = db.Collection("cities").Document("SF");
db.RunTransactionAsync(transaction =>
    {
        return transaction.GetSnapshotAsync(cityRef).ContinueWith((snapshotTask) =>
        {
            DocumentSnapshot snapshot = snapshotTask.Result;
            long newPopulation = snapshot.GetValue<long>("Population") + 1;
            Dictionary<string, object> updates = new Dictionary<string, object>
            {
                { "Population", newPopulation}
            };
            transaction.Update(cityRef, updates);
        });
    });

C#

DocumentReference cityRef = db.Collection("cities").Document("SF");
await db.RunTransactionAsync(async transaction =>
{
    DocumentSnapshot snapshot = await transaction.GetSnapshotAsync(cityRef);
    long newPopulation = snapshot.GetValue<long>("Population") + 1;
    Dictionary<string, object> updates = new Dictionary<string, object>
    {
        { "Population", newPopulation}
    };
    transaction.Update(cityRef, updates);
});
Program.cs

Ruby

city_ref = firestore.doc "#{collection_path}/SF"

firestore.transaction do |tx|
  new_population = tx.get(city_ref).data[:population] + 1
  puts "New population is #{new_population}."
  tx.update city_ref, { population: new_population }
end
transactions_and_batched_writes.rb

Web

import { doc, runTransaction } from "firebase/firestore";

// Create a reference to the SF doc.
const sfDocRef = doc(db, "cities", "SF");

try {
  const newPopulation = await runTransaction(db, async (transaction) => {
    const sfDoc = await transaction.get(sfDocRef);
    if (!sfDoc.exists()) {
      throw "Document does not exist!";
    }

    const newPop = sfDoc.data().population + 1;
    if (newPop <= 1000000) {
      transaction.update(sfDocRef, { population: newPop });
      return newPop;
    } else {
      return Promise.reject("Sorry! Population is too big");
    }
  });

  console.log("Population increased to ", newPopulation);
} catch (e) {
  // This will be a "population is too big" error.
  console.error(e);
}
transaction_promise.js

Web

// Create a reference to the SF doc.
var sfDocRef = db.collection("cities").doc("SF");

db.runTransaction((transaction) => {
    return transaction.get(sfDocRef).then((sfDoc) => {
        if (!sfDoc.exists) {
            throw "Document does not exist!";
        }

        var newPopulation = sfDoc.data().population + 1;
        if (newPopulation <= 1000000) {
            transaction.update(sfDocRef, { population: newPopulation });
            return newPopulation;
        } else {
            return Promise.reject("Sorry! Population is too big.");
        }
    });
}).then((newPopulation) => {
    console.log("Population increased to ", newPopulation);
}).catch((err) => {
    // This will be an "population is too big" error.
    console.error(err);
});
test.firestore.js

Swift

let sfReference = db.collection("cities").document("SF")

do {
  let object = try await db.runTransaction({ (transaction, errorPointer) -> Any? in
    let sfDocument: DocumentSnapshot
    do {
      try sfDocument = transaction.getDocument(sfReference)
    } catch let fetchError as NSError {
      errorPointer?.pointee = fetchError
      return nil
    }

    guard let oldPopulation = sfDocument.data()?["population"] as? Int else {
      let error = NSError(
        domain: "AppErrorDomain",
        code: -1,
        userInfo: [
          NSLocalizedDescriptionKey: "Unable to retrieve population from snapshot \(sfDocument)"
        ]
      )
      errorPointer?.pointee = error
      return nil
    }

    // Note: this could be done without a transaction
    //       by updating the population using FieldValue.increment()
    let newPopulation = oldPopulation + 1
    guard newPopulation <= 1000000 else {
      let error = NSError(
        domain: "AppErrorDomain",
        code: -2,
        userInfo: [NSLocalizedDescriptionKey: "Population \(newPopulation) too big"]
      )
      errorPointer?.pointee = error
      return nil
    }

    transaction.updateData(["population": newPopulation], forDocument: sfReference)
    return newPopulation
  })
  print("Population increased to \(object!)")
} catch {
  print("Error updating population: \(error)")
}
ViewController.swift

Objective-C

FIRDocumentReference *sfReference =
[[self.db collectionWithPath:@"cities"] documentWithPath:@"SF"];
[self.db runTransactionWithBlock:^id (FIRTransaction *transaction, NSError **errorPointer) {
  FIRDocumentSnapshot *sfDocument = [transaction getDocument:sfReference error:errorPointer];
  if (*errorPointer != nil) { return nil; }

  if (![sfDocument.data[@"population"] isKindOfClass:[NSNumber class]]) {
    *errorPointer = [NSError errorWithDomain:@"AppErrorDomain" code:-1 userInfo:@{
      NSLocalizedDescriptionKey: @"Unable to retreive population from snapshot"
    }];
    return nil;
  }
  NSInteger population = [sfDocument.data[@"population"] integerValue];

  population++;
  if (population >= 1000000) {
    *errorPointer = [NSError errorWithDomain:@"AppErrorDomain" code:-2 userInfo:@{
      NSLocalizedDescriptionKey: @"Population too big"
    }];
    return @(population);
  }

  [transaction updateData:@{ @"population": @(population) } forDocument:sfReference];

  return nil;
} completion:^(id result, NSError *error) {
  if (error != nil) {
    NSLog(@"Transaction failed: %@", error);
  } else {
    NSLog(@"Population increased to %@", result);
  }
}];
ViewController.m

Kotlin+KTX

val sfDocRef = db.collection("cities").document("SF")

db.runTransaction { transaction ->
    val snapshot = transaction.get(sfDocRef)
    val newPopulation = snapshot.getDouble("population")!! + 1
    if (newPopulation <= 1000000) {
        transaction.update(sfDocRef, "population", newPopulation)
        newPopulation
    } else {
        throw FirebaseFirestoreException(
            "Population too high",
            FirebaseFirestoreException.Code.ABORTED,
        )
    }
}.addOnSuccessListener { result ->
    Log.d(TAG, "Transaction success: $result")
}.addOnFailureListener { e ->
    Log.w(TAG, "Transaction failure.", e)
}
DocSnippets.kt

Java

final DocumentReference sfDocRef = db.collection("cities").document("SF");

db.runTransaction(new Transaction.Function<Double>() {
    @Override
    public Double apply(@NonNull Transaction transaction) throws FirebaseFirestoreException {
        DocumentSnapshot snapshot = transaction.get(sfDocRef);
        double newPopulation = snapshot.getDouble("population") + 1;
        if (newPopulation <= 1000000) {
            transaction.update(sfDocRef, "population", newPopulation);
            return newPopulation;
        } else {
            throw new FirebaseFirestoreException("Population too high",
                    FirebaseFirestoreException.Code.ABORTED);
        }
    }
}).addOnSuccessListener(new OnSuccessListener<Double>() {
    @Override
    public void onSuccess(Double result) {
        Log.d(TAG, "Transaction success: " + result);
    }
})
.addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception e) {
        Log.w(TAG, "Transaction failure.", e);
    }
});
DocSnippets.java

Dart

final sfDocRef = db.collection("cities").doc("SF");
db.runTransaction((transaction) {
  return transaction.get(sfDocRef).then((sfDoc) {
    final newPopulation = sfDoc.get("population") + 1;
    transaction.update(sfDocRef, {"population": newPopulation});
    return newPopulation;
  });
}).then(
  (newPopulation) => print("Population increased to $newPopulation"),
  onError: (e) => print("Error updating document $e"),
);
firestore.dart

Java

final DocumentReference docRef = db.collection("cities").document("SF");
ApiFuture<String> futureTransaction =
    db.runTransaction(
        transaction -> {
          DocumentSnapshot snapshot = transaction.get(docRef).get();
          Long newPopulation = snapshot.getLong("population") + 1;
          // conditionally update based on current population
          if (newPopulation <= 1000000L) {
            transaction.update(docRef, "population", newPopulation);
            return "Population increased to " + newPopulation;
          } else {
            throw new Exception("Sorry! Population is too big.");
          }
        });
// Print information retrieved from transaction
System.out.println(futureTransaction.get());
ManageDataSnippets.java

Python

transaction = db.transaction()
city_ref = db.collection("cities").document("SF")

@firestore.transactional
def update_in_transaction(transaction, city_ref):
    snapshot = city_ref.get(transaction=transaction)
    new_population = snapshot.get("population") + 1

    if new_population < 1000000:
        transaction.update(city_ref, {"population": new_population})
        return True
    else:
        return False

result = update_in_transaction(transaction, city_ref)
if result:
    print("Population updated")
else:
    print("Sorry! Population is too big.")
snippets.py

Python

transaction = db.transaction()
city_ref = db.collection("cities").document("SF")

@firestore.async_transactional
async def update_in_transaction(transaction, city_ref):
    snapshot = await city_ref.get(transaction=transaction)
    new_population = snapshot.get("population") + 1

    if new_population < 1000000:
        transaction.update(city_ref, {"population": new_population})
        return True
    else:
        return False

result = await update_in_transaction(transaction, city_ref)
if result:
    print("Population updated")
else:
    print("Sorry! Population is too big.")
snippets.py

C++

// This is not yet supported.

Node.js

const cityRef = db.collection('cities').doc('SF');
try {
  const res = await db.runTransaction(async t => {
    const doc = await t.get(cityRef);
    const newPopulation = doc.data().population + 1;
    if (newPopulation <= 1000000) {
      await t.update(cityRef, { population: newPopulation });
      return `Population increased to ${newPopulation}`;
    } else {
      throw 'Sorry! Population is too big.';
    }
  });
  console.log('Transaction success', res);
} catch (e) {
  console.log('Transaction failure:', e);
}
index.js

Go

import (
	"context"
	"errors"
	"log"

	"cloud.google.com/go/firestore"
)

func infoTransaction(ctx context.Context, client *firestore.Client) (int64, error) {
	var updatedPop int64
	ref := client.Collection("cities").Doc("SF")
	err := client.RunTransaction(ctx, func(ctx context.Context, tx *firestore.Transaction) error {
		doc, err := tx.Get(ref)
		if err != nil {
			return err
		}
		pop, err := doc.DataAt("population")
		if err != nil {
			return err
		}
		newpop := pop.(int64) + 1
		if newpop <= 1000000 {
			err := tx.Set(ref, map[string]interface{}{
				"population": newpop,
			}, firestore.MergeAll)
			if err == nil {
				updatedPop = newpop
			}
			return err
		}
		return errors.New("population is too big")
	})
	if err != nil {
		// Handle any errors in an appropriate way, such as returning them.
		log.Printf("An error has occurred: %s", err)
	}
	return updatedPop, err
}
save_transaction_document_update_conditional.go

PHP

$cityRef = $db->collection('samples/php/cities')->document('SF');
$transactionResult = $db->runTransaction(function (Transaction $transaction) use ($cityRef) {
    $snapshot = $transaction->snapshot($cityRef);
    $newPopulation = $snapshot['population'] + 1;
    if ($newPopulation <= 1000000) {
        $transaction->update($cityRef, [
            ['path' => 'population', 'value' => $newPopulation]
        ]);
        return true;
    } else {
        return false;
    }
});

if ($transactionResult) {
    printf('Population updated successfully.' . PHP_EOL);
} else {
    printf('Sorry! Population is too big.' . PHP_EOL);
}
transaction_document_update_conditional.php

Unity

DocumentReference cityRef = db.Collection("cities").Document("SF");
db.RunTransactionAsync(transaction =>
{
    return transaction.GetSnapshotAsync(cityRef).ContinueWith((task) =>
    {
        long newPopulation = task.Result.GetValue<long>("Population") + 1;
        if (newPopulation <= 1000000)
        {
            Dictionary<string, object> updates = new Dictionary<string, object>
            {
                { "Population", newPopulation}
            };
            transaction.Update(cityRef, updates);
            return true;
        }
        else
        {
            return false;
        } 
    });
}).ContinueWith((transactionResultTask) =>
{
    if (transactionResultTask.Result)
    {
        Console.WriteLine("Population updated successfully.");
    }
    else
    {
        Console.WriteLine("Sorry! Population is too big.");
    } 
});

C#

DocumentReference cityRef = db.Collection("cities").Document("SF");
bool transactionResult = await db.RunTransactionAsync(async transaction =>
{
    DocumentSnapshot snapshot = await transaction.GetSnapshotAsync(cityRef);
    long newPopulation = snapshot.GetValue<long>("Population") + 1;
    if (newPopulation <= 1000000)
    {
        Dictionary<string, object> updates = new Dictionary<string, object>
        {
            { "Population", newPopulation}
        };
        transaction.Update(cityRef, updates);
        return true;
    }
    else
    {
        return false;
    }
});

if (transactionResult)
{
    Console.WriteLine("Population updated successfully.");
}
else
{
    Console.WriteLine("Sorry! Population is too big.");
}
Program.cs

Ruby

city_ref = firestore.doc "#{collection_path}/SF"

updated = firestore.transaction do |tx|
  new_population = tx.get(city_ref).data[:population] + 1
  if new_population < 1_000_000
    tx.update city_ref, { population: new_population }
    true
  end
end

if updated
  puts "Population updated!"
else
  puts "Sorry! Population is too big."
end
transactions_and_batched_writes.rb

Web

import { writeBatch, doc } from "firebase/firestore"; 

// Get a new write batch
const batch = writeBatch(db);

// Set the value of 'NYC'
const nycRef = doc(db, "cities", "NYC");
batch.set(nycRef, {name: "New York City"});

// Update the population of 'SF'
const sfRef = doc(db, "cities", "SF");
batch.update(sfRef, {"population": 1000000});

// Delete the city 'LA'
const laRef = doc(db, "cities", "LA");
batch.delete(laRef);

// Commit the batch
await batch.commit();
write_batch.js

Web

// Get a new write batch
var batch = db.batch();

// Set the value of 'NYC'
var nycRef = db.collection("cities").doc("NYC");
batch.set(nycRef, {name: "New York City"});

// Update the population of 'SF'
var sfRef = db.collection("cities").doc("SF");
batch.update(sfRef, {"population": 1000000});

// Delete the city 'LA'
var laRef = db.collection("cities").doc("LA");
batch.delete(laRef);

// Commit the batch
batch.commit().then(() => {
    // ...
});
test.firestore.js

Swift

// Get new write batch
let batch = db.batch()

// Set the value of 'NYC'
let nycRef = db.collection("cities").document("NYC")
batch.setData([:], forDocument: nycRef)

// Update the population of 'SF'
let sfRef = db.collection("cities").document("SF")
batch.updateData(["population": 1000000 ], forDocument: sfRef)

// Delete the city 'LA'
let laRef = db.collection("cities").document("LA")
batch.deleteDocument(laRef)

// Commit the batch
do {
  try await batch.commit()
  print("Batch write succeeded.")
} catch {
  print("Error writing batch: \(error)")
}
ViewController.swift

Objective-C

// Get new write batch
FIRWriteBatch *batch = [self.db batch];

// Set the value of 'NYC'
FIRDocumentReference *nycRef =
    [[self.db collectionWithPath:@"cities"] documentWithPath:@"NYC"];
[batch setData:@{} forDocument:nycRef];

// Update the population of 'SF'
FIRDocumentReference *sfRef =
    [[self.db collectionWithPath:@"cities"] documentWithPath:@"SF"];
[batch updateData:@{ @"population": @1000000 } forDocument:sfRef];

// Delete the city 'LA'
FIRDocumentReference *laRef =
    [[self.db collectionWithPath:@"cities"] documentWithPath:@"LA"];
[batch deleteDocument:laRef];

// Commit the batch
[batch commitWithCompletion:^(NSError * _Nullable error) {
  if (error != nil) {
    NSLog(@"Error writing batch %@", error);
  } else {
    NSLog(@"Batch write succeeded.");
  }
}];
ViewController.m

Kotlin+KTX

val nycRef = db.collection("cities").document("NYC")
val sfRef = db.collection("cities").document("SF")
val laRef = db.collection("cities").document("LA")

// Get a new write batch and commit all write operations
db.runBatch { batch ->
    // Set the value of 'NYC'
    batch.set(nycRef, City())

    // Update the population of 'SF'
    batch.update(sfRef, "population", 1000000L)

    // Delete the city 'LA'
    batch.delete(laRef)
}.addOnCompleteListener {
    // ...
}
DocSnippets.kt

Java

// Get a new write batch
WriteBatch batch = db.batch();

// Set the value of 'NYC'
DocumentReference nycRef = db.collection("cities").document("NYC");
batch.set(nycRef, new City());

// Update the population of 'SF'
DocumentReference sfRef = db.collection("cities").document("SF");
batch.update(sfRef, "population", 1000000L);

// Delete the city 'LA'
DocumentReference laRef = db.collection("cities").document("LA");
batch.delete(laRef);

// Commit the batch
batch.commit().addOnCompleteListener(new OnCompleteListener<Void>() {
    @Override
    public void onComplete(@NonNull Task<Void> task) {
        // ...
    }
});
DocSnippets.java

Dart

// Get a new write batch
final batch = db.batch();

// Set the value of 'NYC'
var nycRef = db.collection("cities").doc("NYC");
batch.set(nycRef, {"name": "New York City"});

// Update the population of 'SF'
var sfRef = db.collection("cities").doc("SF");
batch.update(sfRef, {"population": 1000000});

// Delete the city 'LA'
var laRef = db.collection("cities").doc("LA");
batch.delete(laRef);

// Commit the batch
batch.commit().then((_) {
  // ...
});
firestore.dart

Java

// Get a new write batch
WriteBatch batch = db.batch();

// Set the value of 'NYC'
DocumentReference nycRef = db.collection("cities").document("NYC");
batch.set(nycRef, new City());

// Update the population of 'SF'
DocumentReference sfRef = db.collection("cities").document("SF");
batch.update(sfRef, "population", 1000000L);

// Delete the city 'LA'
DocumentReference laRef = db.collection("cities").document("LA");
batch.delete(laRef);

// asynchronously commit the batch
ApiFuture<List<WriteResult>> future = batch.commit();
// ...
// future.get() blocks on batch commit operation
for (WriteResult result : future.get()) {
  System.out.println("Update time : " + result.getUpdateTime());
}
ManageDataSnippets.java

Python

batch = db.batch()

# Set the data for NYC
nyc_ref = db.collection("cities").document("NYC")
batch.set(nyc_ref, {"name": "New York City"})

# Update the population for SF
sf_ref = db.collection("cities").document("SF")
batch.update(sf_ref, {"population": 1000000})

# Delete DEN
den_ref = db.collection("cities").document("DEN")
batch.delete(den_ref)

# Commit the batch
batch.commit()
snippets.py

Python

batch = db.batch()

# Set the data for NYC
nyc_ref = db.collection("cities").document("NYC")
batch.set(nyc_ref, {"name": "New York City"})

# Update the population for SF
sf_ref = db.collection("cities").document("SF")
batch.update(sf_ref, {"population": 1000000})

# Delete DEN
den_ref = db.collection("cities").document("DEN")
batch.delete(den_ref)

# Commit the batch
await batch.commit()
snippets.py

C++

// Get a new write batch
WriteBatch batch = db->batch();

// Set the value of 'NYC'
DocumentReference nyc_ref = db->Collection("cities").Document("NYC");
batch.Set(nyc_ref, {});

// Update the population of 'SF'
DocumentReference sf_ref = db->Collection("cities").Document("SF");
batch.Update(sf_ref, {{"population", FieldValue::Integer(1000000)}});

// Delete the city 'LA'
DocumentReference la_ref = db->Collection("cities").Document("LA");
batch.Delete(la_ref);

// Commit the batch
batch.Commit().OnCompletion([](const Future<void>& future) {
  if (future.error() == Error::kErrorOk) {
    std::cout << "Write batch success!" << std::endl;
  } else {
    std::cout << "Write batch failure: " << future.error_message() << std::endl;
  }
});
snippets.cpp

Node.js

// Get a new write batch
const batch = db.batch();

// Set the value of 'NYC'
const nycRef = db.collection('cities').doc('NYC');
batch.set(nycRef, {name: 'New York City'});

// Update the population of 'SF'
const sfRef = db.collection('cities').doc('SF');
batch.update(sfRef, {population: 1000000});

// Delete the city 'LA'
const laRef = db.collection('cities').doc('LA');
batch.delete(laRef);

// Commit the batch
await batch.commit();
index.js

Go

import (
	"context"
	"log"

	"cloud.google.com/go/firestore"
)

func batchWrite(ctx context.Context, client *firestore.Client) error {
	// Get a new write batch.
	batch := client.Batch()

	// Set the value of "NYC".
	nycRef := client.Collection("cities").Doc("NYC")
	batch.Set(nycRef, map[string]interface{}{
		"name": "New York City",
	})

	// Update the population of "SF".
	sfRef := client.Collection("cities").Doc("SF")
	batch.Set(sfRef, map[string]interface{}{
		"population": 1000000,
	}, firestore.MergeAll)

	// Delete the city "LA".
	laRef := client.Collection("cities").Doc("LA")
	batch.Delete(laRef)

	// Commit the batch.
	_, err := batch.Commit(ctx)
	if err != nil {
		// Handle any errors in an appropriate way, such as returning them.
		log.Printf("An error has occurred: %s", err)
	}

	return err
}
save_data_batch_writes.go

PHP

$batch = $db->batch();

# Set the data for NYC
$nycRef = $db->collection('samples/php/cities')->document('NYC');
$batch->set($nycRef, [
    'name' => 'New York City'
]);

# Update the population for SF
$sfRef = $db->collection('samples/php/cities')->document('SF');
$batch->update($sfRef, [
    ['path' => 'population', 'value' => 1000000]
]);

# Delete LA
$laRef = $db->collection('samples/php/cities')->document('LA');
$batch->delete($laRef);

# Commit the batch
$batch->commit();
data_batch_writes.php

Unity

WriteBatch batch = db.StartBatch();

// Set the data for NYC
DocumentReference nycRef = db.Collection("cities").Document("NYC");
Dictionary<string, object> nycData = new Dictionary<string, object>
{
    { "name", "New York City" }
};
batch.Set(nycRef, nycData);

// Update the population for SF
DocumentReference sfRef = db.Collection("cities").Document("SF");
Dictionary<string, object> updates = new Dictionary<string, object>
{
    { "Population", 1000000}
};
batch.Update(sfRef, updates);

// Delete LA
DocumentReference laRef = db.Collection("cities").Document("LA");
batch.Delete(laRef);

// Commit the batch
batch.CommitAsync();

C#

WriteBatch batch = db.StartBatch();

// Set the data for NYC
DocumentReference nycRef = db.Collection("cities").Document("NYC");
Dictionary<string, object> nycData = new Dictionary<string, object>
{
    { "name", "New York City" }
};
batch.Set(nycRef, nycData);

// Update the population for SF
DocumentReference sfRef = db.Collection("cities").Document("SF");
Dictionary<string, object> updates = new Dictionary<string, object>
{
    { "Population", 1000000}
};
batch.Update(sfRef, updates);

// Delete LA
DocumentReference laRef = db.Collection("cities").Document("LA");
batch.Delete(laRef);

// Commit the batch
await batch.CommitAsync();
Program.cs

Ruby

firestore.batch do |b|
  # Set the data for NYC
  b.set "#{collection_path}/NYC", { name: "New York City" }

  # Update the population for SF
  b.update "#{collection_path}/SF", { population: 1_000_000 }

  # Delete LA
  b.delete "#{collection_path}/LA"
end
transactions_and_batched_writes.rb