40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
from itertools import izip
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from django.db.models import Count
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from regluit.core import models
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def list_popular():
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"""Compare calculating popular works using QuerySets + distinct() and order_by() with an alternate approach """
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w1 = models.Work.objects.filter(wishlists__isnull=False). \
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distinct().annotate(wished=Count('wishlists')).order_by('-wished', 'id')
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# create a list of tuples of Works + the wishlist count, filter by non-zero wishlist counts, sort the list by descending
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# number of wishlists + Work.id and then blot out the wishlist count
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w0 = map (lambda x: x[0],
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sorted(
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filter(lambda x: x[1] > 0,
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[(w, w.wishlists.count()) for w in models.Work.objects.all()]
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) ,
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key=lambda x: (-x[1],x[0].id)
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)
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)
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print w1.count()
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print len(w0)
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print list(w1.all()) == w0
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print "difference: ", filter(lambda item: item[1][0] != item[1][1], enumerate(izip(w0,w1)))
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def list_new():
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"""Compare calculating new works using QuerySets + distinct() and order_by() with an alternate approach """
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w1 = models.Work.objects.filter(wishlists__isnull=False).distinct().order_by('-created', 'id')
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w0 = [w for w in models.Work.objects.order_by('-created', 'id') if w.wishlists.count()]
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print w1.count()
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print len(w0)
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print list(w1.all()) == w0
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print "difference: ", filter(lambda item: item[1][0] != item[1][1], enumerate(izip(w0,w1))) |