How to chain Django querysets preserving individual order

How to chain Django querysets preserving individual order

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How to chain Django querysets preserving individual order
Tag : python , By : UpperLuck
Date : December 05 2020, 12:24 PM

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How do you order lists in the same way QuerySets are ordered in Django?

Tag : python , By : Neuromaster
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Not automatically, but with a bit of work, yes. You need to define a comparator function (or cmp method on the model class) that can compare two model instances according to the relevant attribute. For instance:
class Dated(models.Model):
  created = models.DateTimeField(default=datetime.now)

  class Meta:
    ordering = ('created',)

  def __cmp__(self, other):
      return cmp(self.created, other.created)
    except AttributeError:
      return cmp(self.created, other)

python sorted and chain - django querysets

Tag : python , By : John Bentley
Date : March 29 2020, 07:55 AM
hop of those help? I have this , How about this getattr() approach:
sorter = lambda x: getattr(x, 'article_in_collection', x.article_in_journal).year
def sorter(x): 
        return x.article_in_collection.year 
    except AttributeError: 
        return x.article_in_journal.year

Django/Python Chain and Sort Querysets

Tag : python , By : shehan
Date : March 29 2020, 07:55 AM
will help you To solve your immediate problem - assuming that's itertools.chain, chain takes multiple iterables. Use chain(*count_items) to expand your list of querysets.
But you can save yourself some trouble by using InventoryDetails.objects.filter(inventory_location__in=inv_locations).order_by('epc').distinct() - that'll do the sorting and uniquing in the database rather than you doing it in your view.

django querysets order by hour, minute and seconds

Tag : sql , By : SpittingCAML
Date : March 29 2020, 07:55 AM
will be helpful for those in need The best solution would be to use a Func:
Tournament.objects.order_by(Func('date', function='"time"')).all()

Django Concatenate Two Querysets IN ORDER

Tag : python , By : Vinicios
Date : March 29 2020, 07:55 AM
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