Room domain model: value or entity?

[4441564944]

If I understand it well, the Room domain model is what Domain-Driven Design (DDD) call Entity / Aggregate root entity, I think it would be better to compare rooms by id only because e.g. the price can change but the room is the same. At this moment the room is represented as a value object (DDD). I would model it like this:

Size =  NewType("Size", int)
Price = NewType("Price", Decimal)
Address = NewType("Address", str)
Description = NewType("Description", str)

class Room:
    """
    An aggregate root entity.
    """
    def __init__(self, id: UUID, size: Size, price: Price, address: Address, description: Description) -> None:
        self.id = id
        self.size = size
        self.price = price
        self.address = address
        self.description = description

    def __eq__(self, that) -> bool:
        return all((isinstance(that, type(self)), self.id == that.id))

    def __hash__(self) -> int:
        return hash((type(self), self.id))

    @classmethod
    def make(cls, id: UUID, size: Size, price: Price, address: Address, description: Description) -> Room:
        return cls(id, size, price, address, description)

Is there some channel where this architectural decisions can be discussed?

All the best, David.

[lgiordani]

David, thanks for the comment. What you say make definitely sense. I'm preparing version 2.0.2 of the book with some fixes, so I will definitely have a look at this. If it doesn't make it in 2.0.2 I will however use it in a future version as I agree that comparing IDs is the best strategy. Thanks!