Deleting fields in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to delete a field named 'age' from a Firestore document.

Firebase

docRef.update({ 'age': [1] })

Drag options to blanks, or click blank then click option'

Afirebase.firestore.FieldValue.delete()

Bnull

Cundefined

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using null or undefined does not delete the field.

Setting the field to 0 does not remove it.

To delete a field in Firestore, you use FieldValue.delete().

2fill in blank

medium

Complete the code to delete the 'address' field from a Firestore document using the modular SDK.

Firebase

updateDoc(docRef, { 'address': [1] })

Drag options to blanks, or click blank then click option'

AFieldValue.delete()

Bnull

Cdelete()

DdeleteField()

Attempts:

3 left

💡 Hint

Common Mistakes

Using FieldValue.delete() is from the older namespaced SDK.

Using null does not delete the field.

In the modular SDK, you import and use deleteField() to delete fields.

3fill in blank

hard

Fix the error in the code to delete the 'phone' field from a Firestore document.

Firebase

docRef.update({ phone: [1] })

Drag options to blanks, or click blank then click option'

Afirebase.firestore.FieldValue.delete()

Bundefined

Cnull

Ddelete()

Attempts:

3 left

💡 Hint

Common Mistakes

Using null or undefined does not remove the field.

Using delete() is not a valid method here.

The correct way to delete a field is to use FieldValue.delete() from the Firestore namespace.

4fill in blank

hard

Fill both blanks to delete the 'email' field using the modular Firestore SDK.

Firebase

import { updateDoc, doc, [1] } from 'firebase/firestore';

await updateDoc(doc(db, 'users', userId), { 'email': [2] });

Drag options to blanks, or click blank then click option'

AdeleteField

BdeleteField()

CFieldValue.delete()

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Importing with parentheses is wrong.

Using FieldValue.delete() is from the older SDK.

Setting the field to null does not delete it.

In modular SDK, you import deleteField and call it as deleteField() to delete a field.

5fill in blank

hard

Fill all three blanks to delete multiple fields 'city', 'state', and 'zip' in one update call using the modular SDK.

Firebase

import { updateDoc, doc, [1] } from 'firebase/firestore';

await updateDoc(doc(db, 'locations', locationId), {
  'city': [2],
  'state': [3],
  'zip': [3]
});

Drag options to blanks, or click blank then click option'

AdeleteField

BdeleteField()

Cnull

DFieldValue.delete()

Attempts:

3 left

💡 Hint

Common Mistakes

Using null does not delete fields.

Using FieldValue.delete() is from the older SDK.

Not calling deleteField as a function causes errors.

Import deleteField and call it as deleteField() for each field to delete multiple fields in one update.