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    <p>I think the first case would be considered "purer" in the sense that the getMembership method might require more specific data from the person itself other than its id (Let's assume you do not know the internals of the getMembership method, even though this makes little sense since it's most likely in the same domain).</p> <p>If it turns out that it actually requires data from the Person entity then it will not require a DAO or factory for the person in question.</p> <p>This can be easily called if your language and/or ORM allows you to use proxy objects (and if you have a convenient way to create these proxies).</p> <p>But lets be honest. If you're inquiring about some membership of a person, you most likely already have this Person instance in memory at hand when you call this method.</p> <p>Further down the road in the "infrastructure land" there's also this notion about implementation details which <a href="https://stackoverflow.com/users/23072/uri">Uri</a> already mentioned while I was writing this answer (damn, that was fast bro'!). To be specific, what if you decided that this 'Person' concept suddenly has a composite primary key/identifier in the underlying database... Would you now use an identifier class? Perhaps use that proxy we were talking about?</p> <h2>TL;DR version</h2> <p>Using ID's is really easier in the short run, but if you're already using a solid ORM, I see no reason not to use proxies or some other means to express the object oriented identity of an Entity which doesn't leak implementation details.</p>
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    1. POIs it good practice to use domain objects as keys?
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    1. USDenis 'Alpheus' Cahuk
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    1. COHow do you get a Person? At some point you may want a getPerson(int personId) function [vs getPerson(String name)]. Not a vote against being "pure", but just a note that it can be difficult not to expose implementation details somewhere.
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    2. COAs I said, you will most likely have some kind of Proxy provider or injected Person in the object that requires it as a dependency. It seems to me that this is beyond the scope of this question.
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