Cloud Firestore in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Firestore module in Swift.

iOS Swift

import [1]

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AFirebaseFirestore

BUIKit

CFoundation

DSwiftUI

Attempts:

3 left

💡 Hint

Common Mistakes

Importing UIKit or Foundation instead of FirebaseFirestore.

Forgetting to import any Firestore-related module.

You need to import FirebaseFirestore to use Firestore features in your Swift app.

2fill in blank

medium

Complete the code to get a Firestore database instance.

iOS Swift

let db = Firestore.[1]()

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Adefault

BfirestoreClient

Cshared

Dfirestore

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'shared' or 'default' which are not Firestore methods.

Trying to create a new instance instead of using the provided method.

Use Firestore.firestore() to get the default Firestore database instance.

3fill in blank

hard

Fix the error in the code to add data to a Firestore collection.

iOS Swift

db.collection("users").[1](data: ["name": "Alice", "age": 30]) { error in
  if let error = error {
    print("Error adding document: \(error)")
  } else {
    print("Document added successfully")
  }
}

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AaddDocument

BsetData

CupdateDocument

DcreateDocument

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setData' which requires a document reference, not a collection.

Using 'updateDocument' which updates existing documents only.

Use addDocument(data:completion:) to add a new document with data to a collection.

4fill in blank

hard

Fill both blanks to read documents from a Firestore collection and print their data.

iOS Swift

db.collection("products").[1] { querySnapshot, error in
  if let error = error {
    print("Error getting documents: \(error)")
  } else {
    for document in [2]?.documents ?? [] {
      print(document.data())
    }
  }
}

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AgetDocuments

Bdocuments

CquerySnapshot

DaddSnapshotListener

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'addSnapshotListener' for one-time fetch.

Confusing the querySnapshot variable name.

Use getDocuments to fetch documents once, and querySnapshot holds the result.

5fill in blank

hard

Fill all three blanks to update a specific document's field in Firestore.

iOS Swift

let docRef = db.collection("orders").document([1])
docRef.[2](["status": [3]]) { error in
  if let error = error {
    print("Error updating document: \(error)")
  } else {
    print("Document successfully updated")
  }
}

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A"order123"

BsetData

C"shipped"

DupdateData

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setData' which overwrites the whole document.

Not quoting the document ID or string values.

Use document("order123") to get the document, updateData to update fields, and set the status to "shipped".