Document-collection data model in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get a reference to a collection named 'users'.

Firebase

const usersRef = db.collection('[1]');

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

Adata

Buser

Cusers

Ddocuments

Attempts:

3 left

💡 Hint

Common Mistakes

Using singular 'user' instead of 'users'.

Using 'documents' or 'data' which are not collection names.

The collection name must be exactly 'users' to reference the correct collection.

2fill in blank

medium

Complete the code to get a document with ID 'abc123' from the 'users' collection.

Firebase

const docRef = db.collection('users').[1]('abc123');

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

Adoc

Bget

Ccollection

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' which fetches data but does not reference a document.

Using 'collection' which is for collections, not documents.

Using 'add' which creates a new document.

The doc method is used to reference a specific document by its ID.

3fill in blank

hard

Fix the error in the code to add a new document to the 'users' collection with data.

Firebase

db.collection('users').[1]({ name: 'Alice', age: 30 });

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

Aadd

Bdoc

Cset

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'doc' which only references a document.

Using 'set' which requires a document reference first.

Using 'get' which fetches data.

The add method creates a new document with an auto-generated ID and saves the data.

4fill in blank

hard

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

Firebase

const docRef = db.collection('[1]').[2]('user1');
docRef.set({ active: true });

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

Ausers

Bdoc

Cposts

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'posts' instead of 'users' for the collection.

Using 'add' instead of 'doc' to get a document reference.

First, reference the 'users' collection, then get the document with ID 'user1' using doc.

5fill in blank

hard

Fill all three blanks to query documents where 'age' is greater than 25 in 'users' collection.

Firebase

const queryRef = db.collection('[1]').where('[2]', '[3]', 25);

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

Ausers

Bage

C>

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' instead of 'age' as the field.

Using '<' or '=' instead of '>' for the condition.

Using wrong collection name.

Query the 'users' collection where the field 'age' is greater than 25 using the 'where' method.