Order domain

A class diagram. Orders, line items, products, customers, addresses, payments and discounts, with a label and cardinalities on every relation.

                                         ┌──────────────────┐
                                         │     Customer     │
                                         ├──────────────────┤
                                         │ - name: string   │
                                         │ - email: string  │
                                         └──────────────────┘
                                        places ◇ 1    ◆ 1
                                               │      │
                                      ┌────────┘      └────────┐ ships to
                                      │ *                      │ 0..*
                            ┌──────────────────┐     ┌──────────────────┐
                            │      Order       │     │     Address      │
                            ├──────────────────┤     ├──────────────────┤
                            │ - id: string     │     │ - street: string │
                            │ - placedAt: Date │     │ - city: string   │
                            ├──────────────────┤     └──────────────────┘
                            │ + total(): Money │
                            └──────────────────┘
                       contains ◆ 1   ◆ 1  ◇ 1
                                │     │    │
            ┌───────────────────┘     │    └─────────────────────┐ applies
            │ 1..*         settled by │ 1                        │ 0..*
  ┌──────────────────┐      ┌──────────────────┐     ┌──────────────────────┐
  │     LineItem     │      │     Payment      │     │       Discount       │
  ├──────────────────┤      ├──────────────────┤     ├──────────────────────┤
  │ - quantity: int  │      │ - method: string │     │ - code: string       │
  │ + price: Money   │      └──────────────────┘     │ - percentOff: number │
  └──────────────────┘                               └──────────────────────┘
            │ *
            │ references
            │ 1
   ┌────────────────┐
   │    Product     │
   ├────────────────┤
   │ - sku: string  │
   │ - name: string │
   └────────────────┘

◇── aggregation
─── association
◆── composition

Spec

JSON

{
  "type": "class",
  "theme": "default",
  "legend": true,
  "classes": [
    {
      "id": "order",
      "label": "Order",
      "attributes": [
        {"visibility": "-", "text": "id: string"},
        {"visibility": "-", "text": "placedAt: Date"}
      ],
      "methods": [{"visibility": "+", "text": "total(): Money"}]
    },
    {
      "id": "item",
      "label": "LineItem",
      "attributes": [
        {"visibility": "-", "text": "quantity: int"},
        {"visibility": "+", "text": "price: Money"}
      ]
    },
    {
      "id": "product",
      "label": "Product",
      "attributes": [
        {"visibility": "-", "text": "sku: string"},
        {"visibility": "-", "text": "name: string"}
      ]
    },
    {
      "id": "customer",
      "label": "Customer",
      "attributes": [
        {"visibility": "-", "text": "name: string"},
        {"visibility": "-", "text": "email: string"}
      ]
    },
    {
      "id": "address",
      "label": "Address",
      "attributes": [
        {"visibility": "-", "text": "street: string"},
        {"visibility": "-", "text": "city: string"}
      ]
    },
    {
      "id": "payment",
      "label": "Payment",
      "attributes": [{"visibility": "-", "text": "method: string"}]
    },
    {
      "id": "discount",
      "label": "Discount",
      "attributes": [
        {"visibility": "-", "text": "code: string"},
        {"visibility": "-", "text": "percentOff: number"}
      ]
    }
  ],
  "relations": [
    {
      "id": "contains",
      "from": "order",
      "to": "item",
      "kind": "composition",
      "from_card": "1",
      "to_card": "1..*",
      "label": "contains"
    },
    {
      "id": "references",
      "from": "item",
      "to": "product",
      "kind": "association",
      "from_card": "*",
      "to_card": "1",
      "label": "references"
    },
    {
      "id": "places",
      "from": "customer",
      "to": "order",
      "kind": "aggregation",
      "from_card": "1",
      "to_card": "*",
      "label": "places"
    },
    {
      "id": "ships-to",
      "from": "customer",
      "to": "address",
      "kind": "composition",
      "from_card": "1",
      "to_card": "0..*",
      "label": "ships to"
    },
    {
      "id": "settled-by",
      "from": "order",
      "to": "payment",
      "kind": "composition",
      "from_card": "1",
      "to_card": "1",
      "label": "settled by"
    },
    {
      "id": "applies",
      "from": "order",
      "to": "discount",
      "kind": "aggregation",
      "from_card": "1",
      "to_card": "0..*",
      "label": "applies"
    }
  ]
}

Draw it yourself

diago render order-domain.json > order-domain.svg

Open it in the playground to edit it in your browser.