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Cómo borrar datos de Cloud Firestore

Para borrar un documento, usa el método delete():

Web
db.collection("cities").doc("DC").delete().then(function() {
    console.log("Document successfully deleted!");
}).catch(function(error) {
    console.error("Error removing document: ", error);
});
Swift
db.collection("cities").document("DC").delete() { err in
    if let err = err {
        print("Error removing document: \(err)")
    } else {
        print("Document successfully removed!")
    }
}
Objective-C
[[[self.db collectionWithPath:@"cities"] documentWithPath:@"DC"]
    deleteDocumentWithCompletion:^(NSError * _Nullable error) {
      if (error != nil) {
        NSLog(@"Error removing document: %@", error);
      } else {
        NSLog(@"Document successfully removed!");
      }
}];
  
Android
db.collection("cities").document("DC")
        .delete()
        .addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void aVoid) {
                Log.d(TAG, "DocumentSnapshot successfully deleted!");
            }
        })
        .addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.w(TAG, "Error deleting document", e);
            }
        });
Java
// asynchronously delete a document
ApiFuture<WriteResult> writeResult = db.collection("cities").document("DC").delete();
// ...
System.out.println("Update time : " + writeResult.get().getUpdateTime());
Python
db.collection(u'cities').document(u'DC').delete()
Node.js
var deleteDoc = db.collection('cities').doc('DC').delete();
Go
_, err := client.Collection("cities").Doc("DC").Delete(ctx)
if err != nil {
	return err
}
PHP
$db->collection('cities')->document('DC')->delete();

Borra campos

Para borrar campos específicos de un documento, usa el método FieldValue.delete() cuando actualices un documento:

Web
var cityRef = db.collection('cities').doc('BJ');

// Remove the 'capital' field from the document
var removeCapital = cityRef.update({
    capital: firebase.firestore.FieldValue.delete()
});
Swift
db.collection("cities").document("BJ").updateData([
    "capital": FieldValue.delete(),
]) { err in
    if let err = err {
        print("Error updating document: \(err)")
    } else {
        print("Document successfully updated")
    }
}
Objective-C
[[[self.db collectionWithPath:@"cities"] documentWithPath:@"BJ"] updateData:@{
  @"capital": [FIRFieldValue fieldValueForDelete]
} completion:^(NSError * _Nullable error) {
  if (error != nil) {
    NSLog(@"Error updating document: %@", error);
  } else {
    NSLog(@"Document successfully updated");
  }
}];
  
Android
DocumentReference docRef = db.collection("cities").document("BJ");

// Remove the 'capital' field from the document
Map<String,Object> updates = new HashMap<>();
updates.put("capital", FieldValue.delete());

docRef.update(updates).addOnCompleteListener(new OnCompleteListener<Void>() {
    // ...
    // ...
Java
DocumentReference docRef = db.collection("cities").document("BJ");
Map<String, Object> updates = new HashMap<>();
updates.put("capital", FieldValue.delete());
// Update and delete the "capital" field in the document
ApiFuture<WriteResult> writeResult = docRef.update(updates);
System.out.println("Update time : " + writeResult.get());
Python
city_ref = db.collection(u'cities').document(u'BJ')
city_ref.update({
    u'capital': firestore.DELETE_FIELD
})
Node.js
// Get the `FieldValue` object
var FieldValue = require('firebase-admin').firestore.FieldValue;

// Create a document reference
var cityRef = db.collection('cities').doc('BJ');

// Remove the 'capital' field from the document
var removeCapital = cityRef.update({
  capital: FieldValue.delete()
});
Go
_, err := client.Collection("cities").Doc("BJ").Update(ctx, []firestore.Update{
	{
		Path:  "capital",
		Value: firestore.Delete,
	},
})
if err != nil {
	return err
}
PHP
$cityRef = $db->collection('cities')->document('BJ');
$cityRef->update([
    ['path' => 'capital', 'value' => FieldValue::deleteField()]
]);

Borra colecciones

Para borrar por completo una colección o subcolección en Cloud Firestore, recupera todos los documentos de la colección o subcolección y bórralos. Si tienes colecciones más grandes, te recomendamos borrar los documentos en grupos pequeños para evitar errores de memoria insuficiente. Repite el proceso hasta que borres toda la colección o subcolección.

Para borrar una colección, se debe coordinar una cantidad ilimitada de solicitudes de eliminación individuales. Si necesitas borrar colecciones completas, hazlo únicamente desde un entorno de servidor de confianza. Si bien es posible borrar una colección desde un cliente web o para dispositivos móviles, tiene efectos negativos en el rendimiento y en la seguridad.

Web
// Deleting collections from a Web client is not recommended.
Swift
// Deleting collections from an iOS client is not recommended.
Objective-C
// Deleting collections from an iOS client is not recommended.
  
Android
// Deleting collections from an Android client is not recommended.
Java
/** Delete a collection in batches to avoid out-of-memory errors.
 * Batch size may be tuned based on document size (atmost 1MB) and application requirements.
 */
void deleteCollection(CollectionReference collection, int batchSize) {
  try {
    // retrieve a small batch of documents to avoid out-of-memory errors
    ApiFuture<QuerySnapshot> future = collection.limit(batchSize).get();
    int deleted = 0;
    // future.get() blocks on document retrieval
    List<QueryDocumentSnapshot> documents = future.get().getDocuments();
    for (QueryDocumentSnapshot document : documents) {
      document.getReference().delete();
      ++deleted;
    }
    if (deleted >= batchSize) {
      // retrieve and delete another batch
      deleteCollection(collection, batchSize);
    }
  } catch (Exception e) {
    System.err.println("Error deleting collection : " + e.getMessage());
  }
}
Python
def delete_collection(coll_ref, batch_size):
    docs = coll_ref.limit(10).get()
    deleted = 0

    for doc in docs:
        print(u'Deleting doc {} => {}'.format(doc.id, doc.to_dict()))
        doc.reference.delete()
        deleted = deleted + 1

    if deleted >= batch_size:
        return delete_collection(coll_ref, batch_size)
Node.js
function deleteCollection(db, collectionPath, batchSize) {
  var collectionRef = db.collection(collectionPath);
  var query = collectionRef.orderBy('__name__').limit(batchSize);

  return new Promise((resolve, reject) => {
    deleteQueryBatch(db, query, batchSize, resolve, reject);
  });
}

function deleteQueryBatch(db, query, batchSize, resolve, reject) {
  query.get()
      .then((snapshot) => {
        // When there are no documents left, we are done
        if (snapshot.size == 0) {
          return 0;
        }

        // Delete documents in a batch
        var batch = db.batch();
        snapshot.docs.forEach((doc) => {
          batch.delete(doc.ref);
        });

        return batch.commit().then(() => {
          return snapshot.size;
        });
      }).then((numDeleted) => {
        if (numDeleted === 0) {
          resolve();
          return;
        }

        // Recurse on the next process tick, to avoid
        // exploding the stack.
        process.nextTick(() => {
          deleteQueryBatch(db, query, batchSize, resolve, reject);
        });
      })
      .catch(reject);
}
Go
func deleteCollection(ctx context.Context, client *firestore.Client,
	ref *firestore.CollectionRef, batchSize int) error {

	for {
		// Get a batch of documents
		iter := ref.Limit(batchSize).Documents(ctx)
		numDeleted := 0

		// Iterate through the documents, adding
		// a delete operation for each one to a
		// WriteBatch.
		batch := client.Batch()
		for {
			doc, err := iter.Next()
			if err == iterator.Done {
				break
			}
			if err != nil {
				return err
			}

			batch.Delete(doc.Ref)
			numDeleted++
		}

		// If there are no documents to delete,
		// the process is over.
		if numDeleted == 0 {
			return nil
		}

		_, err := batch.Commit(ctx)
		if err != nil {
			return err
		}
	}
}

PHP
function delete_collection($collectionReference, $batchSize)
{
    $documents = $collectionReference->limit($batchSize)->documents();
    while (!$documents->isEmpty()) {
        foreach ($documents as $document) {
            printf('Deleting document %s' . PHP_EOL, $document->id());
            $document->reference()->delete();
        }
        $documents = $collectionReference->limit($batchSize)->documents();
    }
}

Borra datos con Firebase CLI

También puedes usar Firebase CLI para borrar documentos y colecciones. Usa el siguiente comando para borrar datos:

firebase firestore:delete [options] <<path>>