Cart, Checkout, and Ownership

Goal

This snapshot advances Rivergate Market by teaching you to check out orders and protect seller product mutations.

Every numbered folder is a complete app. Run this stage independently, then compare it with the previous folder.

Prerequisites

Use .NET 8 SDK and Docker for Postgres stages.

Port 5082 must be free. Copy .env.example before database stages.

• .NET 8 SDK
• A code editor and terminal
• Docker from part 4 onward

Concepts

Checkout creates an Order and OrderItems, clears the cart, and decrements stock. Product update/delete authorize against user ownership.

Razor Pages keep handlers close to markup; cookie auth owns the session; EF Core persists catalog and orders.

Walkthrough

Implement checkout and seller product create/edit/delete returning 403 for non-owners.

Read the example, then open the matching snapshot. The repository includes validation, CSRF, and the surrounding structure.

await using var tx = await db.Database.BeginTransactionAsync();
// order + items, stock--, clear cart

Run and verify

Enter 09-Cart-Checkout-And-Ownership, copy .env.example, restore, migrate, and dotnet run on port 5082.

Open http://127.0.0.1:5082. From data lessons onward, Ada and Grace use password123.

docker compose up -d
git clone https://github.com/michaeldunga1/fcc-aspnet-ecommerce.git
cd fcc-aspnet-ecommerce/09-Cart-Checkout-And-Ownership
cp .env.example .env
dotnet restore
dotnet ef database update
dotnet run --urls http://0.0.0.0:5082

Troubleshooting

UI hiding is not authorization—POST as Grace against Ada's product must 403.

For database failures, confirm Docker and the river_NN name. Never commit .env, bin/, obj/, or secrets.

• Read the first exception first
• Rebuild assets after Tailwind class changes
• Never commit secrets

Try this

Complete a checkout as Ada, then attempt to delete Grace's product and confirm 403.

Test a happy path and one invalid or unauthorized request.

• Make one small change
• Test it in the browser
• Compare with the next snapshot only after it works