Spring Data Reactive MongoDB aggregation pipeline

In this story, we’ll explain how to use MongoDB Aggregation Framework with Spring Data Reactive MongoDB.

· Prerequisites
· Overview
∘ MongoDB Aggregation Framework
∘ How does the MongoDB Aggregation Framework work?
· Aggregation pipeline in Spring Reactive
∘ Project Setup
∘ With @Aggregation Annotation
∘ Aggregation With ReactiveMongoTemplate
· Testing
· Conclusion
· References

Prerequisites

This is the list of all the prerequisites for following this story:

• Java 17
• Starter WebFlux 3.1.0
• Maven 3.6.3
• Mongo 4.4 installed
• Postman or Insomnia

Overview

MongoDB Aggregation Framework

The aggregation pipeline is a framework for data aggregation modeled on the concept of data processing pipelines. It’s a way to query documents from MongoDB in a way that breaks down these more confounding queries. It separates complex logic into…