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MongoDB, Part 2: The Aggregation Pipeline, Stage by Stage

Part 2 of my MongoDB learning series: how the aggregation pipeline reshapes documents stage by stage — $unwind, $group, $lookup — plus the type-mismatch bug that silently joins nothing and why stage order is a cost decision.

15 Jul 2026 · 5 min read ·83 views

#aggregation
#java
#mongodb
#spring-data

Learning MongoDB · Part 1

Learning MongoDB, one document at a time

Part one of a series: a Spring Boot 4 playground, the embed-vs-reference call that replaces schema normalization, and the Decimal128 default that would have quietly corrupted every price I stored.

15 Jul 2026 · 6 min read ·92 views

#data-modeling
#java
#learning
#mongodb
#spring-boot