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A flow is what d2 does when something happens: a message comes in, the rules that handle it run, one statement after another, and each can send more messages. The shop's

A small online shop, Grindstone Coffee Gear, as a domain model: what it sells, who buys, their orders, and how orders get to them. Its sample data is in shop-samples; wha

Two flows about carts. A new cart tells the shop who's shopping. Abandoned carts runs once a day (a cron, declared in Init): any cart still open after 48 hours is marked

Every message the shop sends goes through this one rule. Here it keeps the message in the shop's outbox (a Message object, see shop), so the demo shows what would go out

Order placed. When an order is created, the shop issues its invoice, reserves the stock for each line (from the first warehouse that has enough), checks whether that left

Shipped. When a shipment's status becomes shipped, its order is marked shipped and the customer gets the tracking number.

Low stock. When a stock level drops below its reorder point, whoever runs the shop hears about it, with the supplier to call and how long they take to deliver. It runs wh

Each shop flow, run by hand on the sample data (in the [Fiddle](/fiddle?tab=stories&topic=Story:shop-flows), nothing is kept). The triggers in Init start the same flows w

Sample objects for shop: Grindstone Coffee Gear, a made-up shop with 12 products, 6 customers, carts, orders in each status, two warehouses and a return. Each $object Cla