Adding documents (add vs set) in Firebase - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a new document to the collection using Firestore's add method.

Firebase

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

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

Aget

Bset

Cupdate

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using set instead of add when you want Firestore to generate the document ID.

Using update which requires an existing document.

The add method adds a new document with a generated ID to the collection.

2fill in blank

medium

Complete the code to set data for a document with a specific ID using Firestore's set method.

Firebase

db.collection('users').doc('user123').[1]({ name: 'Bob', age: 25 });

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

Aset

Badd

Cupdate

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using add which does not allow specifying the document ID.

Using update which fails if the document does not exist.

The set method writes data to a document with the specified ID, creating it if it doesn't exist.

3fill in blank

hard

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

Firebase

db.collection('orders').doc().[1]({ item: 'Book', quantity: 2 });

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

Aupdate

Badd

Cset

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using add on a document reference instead of a collection.

Using update on a non-existing document.

When using doc() without arguments, you get a reference to a new document ID. To add data, use set on that document reference.

4fill in blank

hard

Fill both blanks to create a new document with a generated ID and set data in one step.

Firebase

db.collection('products').[1]([2]);

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

Aadd

B{ name: 'Laptop', price: 1200 }

Cset

D{ id: 'prod1', name: 'Laptop' }

Attempts:

3 left

💡 Hint

Common Mistakes

Using set without specifying a document reference.

Passing an object with an id field to add.

The add method takes an object with data to create a new document with a generated ID.

5fill in blank

hard

Fill all three blanks to set data on a document with a specific ID and merge it with existing data.

Firebase

db.collection('customers').doc([1]).[2]([3], { merge: true });

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

A'cust123'

Bset

C{ phone: '123-456-7890' }

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using add instead of set when specifying a document ID.

Not using merge option and overwriting existing data.

Use doc('cust123') to specify the document, set to write data, and pass the data object with { merge: true } to merge with existing data.