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.
Series
Learning MongoDB
Coming to document databases from a relational background, in order — modelling, then aggregation, then what the engine does underneath.
Part 2
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.
Next in this series: Indexes and query plans — coming soon.