RxDart by example: combineLatest and data modeling with Firestore

RxDart by example: combineLatest and data modeling with Firestore

RxDart by example: combineLatest and data modeling with Firestore. This tutorial shows how to use the combineLatest operator to combine data from two collections in the Firestore database.

RxDart is a very useful package for working with observables and streams of data that change over time.

This tutorial shows how to use the combineLatest operator to combine data from two collections in the Firestore database.

A movie favourites app is used as an example, evaluating two different solutions that satisfy the same requirements.

Prerequisites:

  • familiarity with streams, StreamBuilder, Firestore collections and documents

HIGHLIGHTS

00:00 - Intro 01:51 - Simple movies app reading data from a simple collection 02:55 - Adding user favourites to the Firestore schema 03:51 - Wiring things up and writing data from the UI 05:27 - Reading data with nested StreamBuilders 06:36 - Combining data with combineLatest: intro 08:12 - Combining data with combineLatest: in practice 10:50 - Updated UI using the new logic 12:09 - Comparing combineLatest with the nested StreamBuilders approach 13:13 - Interactive RxMarbles diagrams 14:03 - Alternative approaches for combining streams 15:02 - Other use cases for combineLatest

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