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Hanami’s database layer separates relations, repositories, and structs

aaronmallen.me 14 min read Editor score 6/10

The overview explains how Hanami organizes its database layer around relations, repositories, and structs rather than a traditional Rails-style model layer. It offers a useful framework-design comparison for engineers evaluating data-access patterns.

What

Hanami’s database layer uses Relations, Repos, and Structs instead of a traditional model layer.

How

Relations define schemas, relationships, and datasets; Repos operate on relations; Structs are frozen object representations with presentation logic.

Why it matters

This separation gives engineers building large systems distinct places for data shape, multi-relation operations, and object presentation.

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