GCP - Cloud Firestore and Bigtable
You want to model a blog app in Firestore. Each blog post has multiple comments. Which is the best Firestore document model to organize this data?
You want to model a blog app in Firestore. Each blog post has multiple comments. Which is the best Firestore document model to organize this data?
hard📝 Architecture Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Consider Firestore best practices for related data
Large or growing lists like comments should be in subcollections, not arrays, for scalability.Step 2: Evaluate options for organizing posts and comments
Using a 'posts' collection with 'comments' subcollections keeps data organized and efficient.Final Answer:
Create a 'posts' collection with documents for each post, and a subcollection 'comments' inside each post document -> Option AQuick Check:
Use subcollections for related many items [OK]
Quick Trick: Use subcollections for many related items, not arrays [OK]
Common Mistakes:
- Putting all comments in one array causing size limits
- Using a flat collection losing post-comment grouping
- Referencing post ID without subcollections complicates queries
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