How do you model the following situation with a class diagram: Every restaurant has at least one kitchen, one kitchen is part of exactly one restaurant

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BlackTom AI · Accepted Answer

The question asks how to model the given situation in a class diagram: every restaurant has at least one kitchen, and one kitchen is part of exactly one restaurant.

First, identify the entities: Restaurant and Kitchen. The facts imply a close, dependent relationship where kitchens belong to a single restaurant and restaurants must have at least one kitchen.

Since every restaurant must have at least one kitchen, the multiplicity from Restaurant to Kitchen should reflect that a Restaurant has one or more Kitchens: Restaurant 1..* Kitchen. This means a single restaurant is associated with one or more Kitchen instances.

Conversely, the fact that a kitchen is part of exactly one restaurant indicates that each Kitchen is linked to a single Restaurant: Kitchen 1 Restaurant. This conveys a strict ownership where a kitchen cannot exist without belonging to a restaurant.

Considering the semantics of a strong ownership (a kitchen cannot exist independently of its restaurant), a composition relationship is appropriate rather than a simple association. Composition communicates that the lifecycle of a Kitchen is tied to its Restaurant.

Putting it together, the appropriate modeling choice is a composition between Restaurant and Kitchen with multiplicities: Restaurant —(1..*)→ Kitchen and Kitchen —(1)→ Restaurant. In practice, you would model Restaurant as the composite owner and Kitchen as the part (the part cannot exist without the owner).

If you opted for a plain association instead of composition, you would still assign the same multiplicities: Restaurant 1..* Kitchen and Kitchen 1 Restaurant. However, this would not convey the lifecycle dependency as clearly as composition.

In short, the correct modeling approach is a composition relationship from Restaurant to Kitchen with multiplicities: Restaurant 1..* and Kitchen 1, indicating that every restaurant has at least one kitchen and every kitchen belongs to exactly one restaurant.

How do you model the following situation with a class diagram: Every restaurant has at least one kitchen, one kitchen is part of exactly one restaurant

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