Document ID strategies in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new document with a specific ID in Firestore.

Firebase

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

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

A'user123'

Bdb.collection('users').doc().id

Cdb.collection('users').doc().autoId()

Ddb.collection('users').doc().id()

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to get an auto-generated ID by calling a method on doc() that doesn't exist.

Passing a method call instead of a string as the document ID.

To create a document with a specific ID, you pass the ID as a string to doc(). Auto-generated IDs require a different method.

2fill in blank

medium

Complete the code to add a new document with an auto-generated ID in Firestore.

Firebase

db.collection('orders').[1]({item: 'book', quantity: 1});

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

Aset

Bdoc

Cadd

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using doc() without arguments but forgetting to call set().

Using set() directly on the collection, which is invalid.

The add() method adds a new document with an auto-generated ID to the collection.

3fill in blank

hard

Fix the error in the code to generate a unique document ID before setting data.

Firebase

const newDocRef = db.collection('products').[1]();
newDocRef.set({name: 'Pen', price: 1.5});

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

Adoc

Bdoc('uniqueId')

Cadd()

Dset()

Attempts:

3 left

💡 Hint

Common Mistakes

Calling add() on the collection and then trying to call set() on the result.

Passing a string to doc() when you want an auto-generated ID.

Calling doc() without arguments creates a reference with a unique auto-generated ID. Then you can call set() on it.

4fill in blank

hard

Fill both blanks to create a document with a custom ID and set data in Firestore.

Firebase

const customId = [1];
db.collection('customers').doc(customId).[2]({email: '[e-mail]'});

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

A'cust_001'

Badd

Cset

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using add() instead of set() when specifying a custom ID.

Passing a variable instead of a string literal for the custom ID.

You assign a string as a custom ID, then call set() on the document reference to save data.

5fill in blank

hard

Fill all three blanks to generate a new document ID, get its ID string, and set data in Firestore.

Firebase

const newDoc = db.collection('invoices').[1]();
const docId = newDoc.[2];
newDoc.[3]({total: 100});

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

Adoc

Bid

Cset

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using add() instead of doc() when needing the document ID before setting data.

Trying to call id() as a function instead of accessing the property.

Use doc() to create a new document reference with an auto-generated ID, access the ID with id, and save data with set().