I'd question whether a method like this should sit in the model (should it actually have knowledge of its sibling persisted objects? Usually not)
Depending on your context, making a small class/service/whatever which determines position might be more suitable (and easier to test/maintain).
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I'd question whether a method like this should sit in the model (should it actually have knowledge of its sibling persisted objects? Usually not)
Depending on your context, making a small class/service/whatever which determines position might be more suitable (and easier to test/maintain).