The scenario
A vehicle repair shop needs a domain model to track customers, their vehicles, service orders, labor, parts, invoices, and payments.
What is in this drawing
Read the decisions behind it.
01
ServiceOrder composes ServiceLineItems (composition) to model order items.
02
Customer owns multiple Vehicles (one-to-many association).
03
Mechanic works on many ServiceOrders (one-to-many association).
04
ServiceOrder generates one Invoice (one-to-one association).
05
Invoice receives many Payments (one-to-many association).
Use this model as a starting point for a repair shop management system, preserving class names and relationships while extending with additional attributes or operations as needed.
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