Description:

This issue aims to create a Firebase Cloud Function that triggers on the creation of a document in the tanam-users/{docId} collection. When a new user document is created, the function should set the user's name attribute in the Firestore document to the displayName from the Firebase Auth user object.

Objectives:

1. Create onDocumentCreated Trigger:

   • Implement a Firebase Cloud Function that triggers when a new document is created in the tanam-users/{docId} collection.

2. Fetch DisplayName from Firebase Auth:

   • Fetch the displayName attribute from the corresponding Firebase Auth user object using the UID from the newly created document. (https://firebase.google.com/docs/reference/admin/node/firebase-admin.auth.userrecord.md#userrecorddisplayname)

3. Update Firestore Document:

   • Set the name attribute in the Firestore document to the fetched displayName.

Acceptance Criteria:

• A Firebase Cloud Function is created that triggers on document creation in the tanam-users/{docId} collection.
• The function fetches the displayName from the Firebase Auth user object using the document ID as the UID.
• The function updates the name attribute in the Firestore document with the fetched displayName.
• Ensure proper error handling in case the displayName is not available or the user does not exist in Firebase Auth.

Notes:

• Verify that the function works correctly by creating new user documents and checking that the name attribute is correctly set from the Firebase Auth displayName.
• Ensure that the function has appropriate permissions to read from Firebase Auth and write to Firestore.