Getting all documents in collection in Firebase - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does 'Getting all documents in collection' mean in Firebase?

It means fetching every document stored inside a specific collection in Firestore, like getting all items from a folder.

beginner

Which Firebase function is used to get all documents from a collection?

The function getDocs() is used along with a collection reference to retrieve all documents.

beginner

How do you create a reference to a collection in Firebase Firestore?

Use collection(db, 'collectionName') where db is your Firestore instance and 'collectionName' is the name of your collection.

intermediate

What type of data structure do you get after fetching all documents from a collection?

You get a QuerySnapshot which contains multiple DocumentSnapshot objects, each representing a document.

intermediate

How can you access the data inside each document after fetching all documents?

You loop through the QuerySnapshot using forEach and call doc.data() on each DocumentSnapshot to get the document's data.

Which function fetches all documents from a Firestore collection?

A getDocs()

B fetchAll()

C getCollection()

D retrieveDocs()

The correct function to fetch all documents is getDocs().

What does collection(db, 'users') do?

A Updates all documents in 'users'

B Creates a new document in 'users'

C Deletes the 'users' collection

D References the 'users' collection in Firestore

It creates a reference to the 'users' collection in Firestore.

After fetching documents, which method gets the data inside a document?

A doc.getData()

B doc.data()

C doc.fetch()

D doc.read()

Use doc.data() to access the document's data.

What type of object holds all documents fetched from a collection?

A CollectionReference

B DocumentSnapshot

C QuerySnapshot

D DocumentReference

A QuerySnapshot contains all the documents fetched.

Which method is commonly used to loop through all documents in a QuerySnapshot?

A forEach()

B reduce()

C filter()

D map()

Use forEach() to loop through each document.

Explain step-by-step how to get all documents from a Firestore collection.

Think about how you open a folder, look at each file, and read its content.

What is the difference between a CollectionReference and a QuerySnapshot in Firestore?

Imagine a folder and the list of files inside it.