Django admin: how to sort by one of the custom list_display fields that has no database field?

I haven't tested this out (I'd be interested to know if it works) but what about defining a custom manager for Customer which includes the number of orders aggregated, and then setting admin_order_field to that aggregate, ie.

I loved Greg's solution to this problem, but I'd like to point that you can do the same thing directly in the admin.

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