How To Clone/Mutate A Model In Django Without Subclassing

Question

'Ello, all. I'm trying to create a model in Django based on - but not subclassing or having a DB relation to - another model. My original model looks something like this: it stores some data with a date/time stamp.

class Entry(Model):  
    data1 = FloatField()  
    data2 = FloatField()  
    entered = DateTimeField()

I'd also like to aggregate the numeric data for each of these entries on a daily basis, using a model that is almost identical. For the DailyAvg() variant, we'll use a DateField() instead of a DateTimeField(), as there'll only be one average per day:

class EntryDailyAvg(Model):  
    data1 = FloatField()  
    data2 = FloatField()  
    entered = DateField()

Thus the problem: There's going to be a lot of these data classes that will need a corresponding daily average model stored in the DB, and the definitions are almost identical. I could just re-type a definition for an equivalent DailyAvg() class for each data class, but that seems to violate DRY, and is also a huge pain in the arse. I also can't have EntryDailyAvg subclass Entry, as Django will save a new Entry base every time I save a new EntryDailyAvg.

Is there a way to automaticaly (-magically?) generate the DailyAvg() class?

Thanks in advance!

Answer 1

What if you create a AbstractEntry class with all the data1 stuff and then, two subclasses: Entry and EntryDailyAvg.

Check the docs for info on how to tell django that one class is abstract.