beginner~2h
DTOs & Entity Mapping
Module 06 flagged the risk. This module is the fix, done properly, and the mapping code that comes with it.
Learning objectives
- Beginner: A single response DTO per entity, manually mapped in the service layer.
- Intermediate: Separate create/update/response DTOs per resource, since what's valid to create often differs from what's valid to update (e.g. an update might allow a partial subset of fields).
- Advanced: MapStruct-generated mappers across a large API surface, with custom mapping methods for fields needing non-trivial transformation (e.g. flattening a nested entity relationship into a single DTO field).
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DTOs & Entity Mapping