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bulk create django

By crêppercrêpper on Oct 13, 2020 
bulk_create(objs, batch_size = None, ignore_conflicts = False)

#eg
Entry.objects.bulk_create([
...     Entry(headline='This is a test'),
...     Entry(headline='This is only a test'),
... ])
# inserts in one query (usually), caveats below:
# doesn't signal pre_save and post_save 
# cant use child models
# no many-to-many
# obj list fully evaluates if objs is a generator

Source: docs.djangoproject.com

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3

django bulk update

By crêppercrêpper on Oct 21, 2020 
objs = [
    Entry.objects.create(headline='Entry 1'),
    Entry.objects.create(headline='Entry 2'),
]
objs[0].headline = 'This is entry 1'
objs[1].headline = 'This is entry 2'
Entry.objects.bulk_update(objs, ['headline'])

# Caveats #
# -You cannot update the model’s primary key.
#
# -Each model’s save() method isn’t called, and the pre_save and post_save signals aren’t 
# sent.
#
# -If updating a large number of columns in a large number of rows, the SQL 
# generated can be very large. Avoid this by specifying a suitable batch_size.
#
# - Updating fields defined on multi-table inheritance ancestors will incur an extra query per ancestor.
# If objs contains duplicates, only the first one is updated.

Source: docs.djangoproject.com

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1

django bulk update

By Confused CurlewConfused Curlew on Apr 01, 2021 
objs = []
for person in p:
    obj = People.objects.get(email=person['email'])
    obj.birthday = person['birthday']
    objs.append(obj)
People.objects.bulk_update(objs, ['birthday'], batch_size=1000)

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0

django filter exsist

By TommyTommy on Nov 29, 2020 
if table.objects.filter(prop='value').count() > 0:

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0

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