GCP - Cloud Firestore and Bigtable
Which of the following is the correct way to reference a document named
profile123 in a collection users using Firestore SDK?Which of the following is the correct way to reference a document named profile123 in a collection users using Firestore SDK?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Firestore document referencing
To get a document, first get the collection, then the document by ID.Step 2: Check syntax correctness
db.collection('users').doc('profile123') uses collection() then doc() correctly; db.collection('users/profile123') is invalid because collection() expects a collection path; db.collection('profile123').doc('users') reverses names; db.users.profile123 is invalid syntax.Final Answer:
db.collection('users').doc('profile123') -> Option CQuick Check:
Correct document reference = db.collection('users').doc('profile123') [OK]
Quick Trick: Use collection() then doc() to reference documents [OK]
Common Mistakes:
- Swapping collection and document names
- Using dot notation incorrectly
- Using invalid method chaining
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