I have a model called Offering which has a start date and a duration
in days.
I want to do a query and get instances where the end date (not
modeled) is in the past.
I know that I can add a non-editable field end-date that is computed
in the save method, but this seems denormalized.
I'm curious to see if this is possible using only a start date,
duration, and queries.
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