Given a model like:

class Item(models.Model):
    title = models.CharField(max_length=140)
    created_date =
models.DateTimeField(default=datetime.datetime.now)
    completed = models.BooleanField(default=False)
    completed_date = models.DateTimeField(blank=True,null=True)
    ...

I want to create a queryset that retrieves the last 30 Items that were
either created OR completed most recently. In other words, the
created_date and the completed_date  fields need to be treated as if
they were a single date field on the model, so that the returned items
would be  chronological by either date (completed_date would only be
considered for items where completed=True)

I've tried both:

.order_by('-completed_date','-created_date')[:30]

and

.order_by('-completed_date').order_by('-created_date')[:30]

but neither of these are quite right. Not sure what the right approach
to this should be. Suggestions? Thanks.

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