Creating collections and documents in Firebase - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new collection named 'users'.

Firebase

const usersCollection = firestore.collection('[1]');

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

Adata

Bdocuments

Citems

Dusers

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong collection name like 'documents' or 'data'.

The collection name must be 'users' to create the correct collection.

2fill in blank

medium

Complete the code to add a new document with ID 'user123' to the 'users' collection.

Firebase

firestore.collection('users').doc('[1]').set({ name: 'Alice' });

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AuserId

Buser123

CdocId

D123user

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic ID like 'userId' or a wrong ID like '123user'.

The document ID must be 'user123' to match the intended document.

3fill in blank

hard

Fix the error in the code to correctly add a document with auto-generated ID.

Firebase

firestore.collection('users').[1]({ name: 'Bob' });

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Aadd

Bset

Cdoc

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set' without specifying a document ID causes an error.

The 'add' method creates a new document with an auto-generated ID.

4fill in blank

hard

Fill both blanks to create a document reference and set data in it.

Firebase

const docRef = firestore.collection('[1]').doc('[2]');
docRef.set({ age: 30 });

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

Aemployees

Bemp001

Cusers

Duser001

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing collection and document names or using wrong IDs.

The collection is 'employees' and the document ID is 'emp001' as required.

5fill in blank

hard

Fill all three blanks to create a nested collection and add a document with data.

Firebase

const docRef = firestore.collection('[1]').doc('[2]').collection('[3]');
docRef.add({ status: 'active' });

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

Aprojects

BprojA

Ctasks

Dusers

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong collection or document names or mixing levels.

The code creates a 'tasks' collection inside the 'projA' document of 'projects' collection.