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I have a product entity and a separate class for display and one to retrieve the data from the DB. My colleague wants to let these classes inherit from each other instead:

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The latter is just non-sense. A Product is never a ProductLoader. And the display of a product is also not a product (or eventually it is some different kind of product). So just go with the first solution.

N.B. from what is currently shown the top right arrow should just be a Dependency. Instead of using an attribute you could use a role top left:

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