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''' | |
given a Model with: | |
category = models.CharField(max_length=32, choices=CATEGORY_CHOICES) | |
pubdate = models.DateTimeField(default=datetime.now) | |
<other fields> | |
Fetch the item from each category with the latest pubdate. | |
''' | |
model_max_set = Model.objects.values('category').annotate(max_pubdate=Max('pubdate')).order_by() | |
q_statement = Q() | |
for pair in model_max_set: | |
q_statement |= (Q(category__exact=pair['category']) & Q(pubdate=pair['max_pubdate'])) | |
model_set = Model.objects.filter(q_statement) | |
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