Stop Mixing FastAPI with Business Logic: Fix It with Ports & Adapters
Автор: ArjanCodes
Загружено: 2026-03-06
Просмотров: 18066
Описание:
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In this video, I refactor a FastAPI + SQLAlchemy example into a clean Ports & Adapters (Hexagonal Architecture) design. I separate domain logic from frameworks, introduce domain types and errors, define ports with Protocols, and implement adapters step by step. The result is pure, testable business logic that’s easier to maintain and evolve.
🔥 GitHub Repository: https://git.arjan.codes/2026/ports.
🎓 ArjanCodes Courses: https://www.arjancodes.com/courses.
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⌨️ Keyboard I’m using: https://amzn.to/49YM97v.
🔖 Chapters:
0:00 Intro
1:23 What’s the Actual Problem?
3:11 Ports & Adapters in One Minute
4:25 The Demo Use Case (Keep It Tiny, but Real)
5:44 Step 1 — Create Domain Types (Stop Returning API-Shaped Dicts)
9:39 Step 2 — Introduce Domain Errors (No HTTP in the Domain)
12:54 Step 3 — Define the Port (What the Domain Needs)
14:39 Step 4 — Write the Use Case as Pure Logic
19:25 Step 5 — Create SQLAlchemy Adapter Implementing the Port
24:36 Step 6 — FastAPI Adapter Becomes Translation-Only
24:48 Final Thoughts
#arjancodes #softwaredesign #python
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