Week 8's Tutorial (Class Diagram)

[venuslimm]

Hello, may I know why there isn't a composition between StockItem -> Review?

StockItem consists of Review. Also, Review cannot exist without StockItem, similar to how Rating cannot exist without Review.

Code:

Answer given:

[damithc]

@venuslimm delete cascading is a side effect of composition, not a sufficient condition for it.

Yes, a review cannot exist without a corresponding stock item, but conceptually, is a review part of a stock item? The answer may be subjective but it feels like reviews are entities in their own rights that get attached to stock items rather than being part of a stock item. Still, the decision for deciding if an association is actually a composition is not very clear cut.

[venuslimm]

Okay, thank you!