Adding complex Firestore queries to a Jetpack Compose app

Part ten of an Android Jetpack Compose and Firebase tutorial series expands the Make it So task app with Cloud Firestore queries and a Statistics screen. The new screen displays counts of completed tasks, important completed tasks defined as flagged or high priority, and uncompleted medium- or high-priority tasks, with a ViewModel retrieving the values through StorageService and exposing them as UI state. It demonstrates Firestore filtering with whereEqualTo, logical and and or filters, whereIn, and server-side count aggregations, which avoid transferring all matching documents to the client. The tutorial also improves task-list ordering by adding a server-generated createdAt timestamp to the Task model through @ServerTimestamp and updating the user-task query with orderBy in descending order, ensuring recently created tasks appear first.

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