Getting a single document in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get a single document from Firestore.

Firebase

const docRef = doc(db, 'users', [1]);
const docSnap = await getDoc(docRef);

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

A'db'

B'getDoc'

C'users'

D'userId123'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the collection name instead of the document ID.

Passing the database object instead of the document ID.

You need to specify the document ID to get a single document. Here, 'userId123' is the document ID.

2fill in blank

medium

Complete the code to check if the document exists.

Firebase

if ([1].exists()) {
  console.log('Document data:', docSnap.data());
} else {
  console.log('No such document!');
}

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

AdocRef

BgetDoc

CdocSnap

Ddb

Attempts:

3 left

💡 Hint

Common Mistakes

Calling exists() on the document reference instead of the snapshot.

Using the database object instead of the snapshot.

The exists() method is called on the document snapshot object, which is docSnap.

3fill in blank

hard

Fix the error in the code to correctly import the Firestore functions.

Firebase

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

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

AgetDoc

BdocGet

CfetchDoc

DgetDocument

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect function names like getDocument or fetchDoc.

Misspelling the function name.

The correct function to import for getting a document is getDoc.

4fill in blank

hard

Fill both blanks to create a document reference and get the document snapshot.

Firebase

const docRef = [1](db, 'products', [2]);
const docSnap = await getDoc(docRef);

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

Adoc

BgetDoc

C'productId456'

D'products'

Attempts:

3 left

💡 Hint

Common Mistakes

Using collection name instead of document ID in the second blank.

Using getDoc instead of doc for the first blank.

Use doc to create a document reference and provide the document ID as the third argument.

5fill in blank

hard

Fill all three blanks to check if a document exists and log its data.

Firebase

if ([1].[2]()) {
  console.log('Data:', [3].data());
} else {
  console.log('No document found');
}

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

AdocSnap

BdocRef

Dexists

Attempts:

3 left

💡 Hint

Common Mistakes

Calling exists() on the document reference.

Logging data from the reference instead of the snapshot.

You check if the document snapshot docSnap exists by calling exists(), then log its data.