Domain Project

The Shopfoo.Product project implements domain workflows using the V4 Program.

Here is a simplified view from the solution explorer:

📂 src/
├──📂 Core/
│  ├──🗃️ Shopfoo.Common
│  ├──🗃️ Shopfoo.Domain.Types
│  └──🗃️ Shopfoo.Program
├──📂 Feat/
│  ├──🗃️ Shopfoo.Home
│  └──🗃️ Shopfoo.Product 👈👈
│     ├──📂 Model/
│     │  ├──📄 Product.fs       👈 Validation logic
│     │  ├──📄 Prices.fs
│     │  └──📄 Stock.fs
│     ├──📂 Workflows/
│     │  ├──📄 Prelude.fs       👈 Instructions + helpers
│     │  ├──📄 AddProduct.fs
│     │  ├──📄 DetermineStock.fs
│     │  ├──📄 MarkAsSoldOut.fs
│     │  ├──📄 RemoveListPrice.fs
│     │  ├──📄 SavePrices.fs
│     │  ├──📄 SaveProduct.fs
│     │  └──📄 ...
│     ├──📂 Data/
│     ├──📄 Api.fs
│     ├──📄 DependencyInjection.fs
│     └──📄 Manifest.fs
└──📂 UI/
   ├──🗃️ Shopfoo.Client
   ├──🗃️ Shopfoo.Server
   └──🗃️ Shopfoo.Shared

We will examine each part separately:

• Domain Model explains how the domain model is split between shared types (Domain.Types) and aggregates (Model/) following DDD principles.

• Instructions describes how the instruction interface is defined, along with the ergonomic helpers for composing programs.

• Workflows presents how to write domain workflows by analyzing typical use cases, including parallel execution and workflow cancellation with undo (saga pattern).

• Data indicates a way to organize the data access layer, whether it is to access a database or call an external API.

• Api describes how to define the project entry point, wire instructions to the data layer with undo strategies, and run workflows through the saga runner.