Firestore Data Modeling Patterns

Overview

Firestore is a NoSQL document database that requires careful modeling to optimize for query patterns, scalability, and cost. This skill provides patterns for structuring data effectively.

Subcollections vs. Root Collections

When to Use Subcollections

Pattern: users/{userId}/orders/{orderId}

Use When:

• Data is tightly coupled to a parent (orders belong to a specific user)
• Child data is always accessed via parent
• You don't need to query children globally across all parents
• Document hierarchy makes semantic sense